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R. H. Hardin, <a href="/A233911/b233911.txt">Table of n, a(n) for n = 1..210</a>

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Number of (n+1)X(2+1) 0..7 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 30, and no two adjacent values equal

640, 3944, 22632, 138132, 807964, 4908404, 28936484, 175407492, 1039210048, 6291984872, 37411050288, 226333090864, 1349436837188, 8159273967724, 48752105141528, 294639966341512, 1763518515517052, 10653925639599432

1,1

Column 2 of A233917

Empirical: a(n) = 4*a(n-1) +122*a(n-2) -461*a(n-3) -6376*a(n-4) +22883*a(n-5) +188152*a(n-6) -648596*a(n-7) -3478827*a(n-8) +11715412*a(n-9) +42308852*a(n-10) -142371381*a(n-11) -345931578*a(n-12) +1197824103*a(n-13) +1908669954*a(n-14) -7078856586*a(n-15) -6995027392*a(n-16) +29551303874*a(n-17) +16143386244*a(n-18) -87052258170*a(n-19) -19433628990*a(n-20) +179619345422*a(n-21) -2128109482*a(n-22) -255775086626*a(n-23) +46189589396*a(n-24) +245226941694*a(n-25) -73044737386*a(n-26) -152167442028*a(n-27) +56827325500*a(n-28) +57294922304*a(n-29) -23672423108*a(n-30) -11706249412*a(n-31) +4940867468*a(n-32) +1040756704*a(n-33) -439680112*a(n-34) -20118176*a(n-35) +11155520*a(n-36) -250624*a(n-37) -14592*a(n-38)

Some solutions for n=4

..2..0..2....2..6..2....0..4..3....1..4..1....6..5..6....0..1..0....0..3..7

..5..4..1....4..7..5....2..1..5....5..6..2....4..1..4....3..5..3....4..5..4

..2..0..2....2..6..2....6..3..2....1..3..1....3..5..3....0..1..0....6..2..6

..1..4..1....5..7..4....5..1..5....5..6..5....4..1..4....3..5..2....7..5..7

..5..3..5....6..3..2....3..4..6....7..3..7....3..5..3....7..4..6....3..6..3

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R. H. Hardin, Dec 17 2013

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