A233910 - OEIS

A233910

Number of (n+1)X(1+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

160, 640, 2440, 9612, 36976, 145004, 559736, 2189924, 8470344, 33088100, 128155456, 500055876, 1938715672, 7558416852, 29325538832, 114258452900, 443550616168, 1727342374724, 6708320872096, 26115152683348, 101452849075768

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OFFSET

1,1

COMMENTS

Column 1 of A233917

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 24*a(n-2) +6*a(n-3) -177*a(n-4) -52*a(n-5) +516*a(n-6) +80*a(n-7) -646*a(n-8) +42*a(n-9) +284*a(n-10) -80*a(n-11)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A184070 A278122 A233917 * A234658 A234651 A234898

Adjacent sequences: A233907 A233908 A233909 * A233911 A233912 A233913

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2013

STATUS

approved