# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a233910 Showing 1-1 of 1 %I A233910 #4 Dec 17 2013 16:10:03 %S A233910 160,640,2440,9612,36976,145004,559736,2189924,8470344,33088100, %T A233910 128155456,500055876,1938715672,7558416852,29325538832,114258452900, %U A233910 443550616168,1727342374724,6708320872096,26115152683348,101452849075768 %N 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 %C A233910 Column 1 of A233917 %H A233910 R. H. Hardin, Table of n, a(n) for n = 1..210 %F A233910 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) %e A233910 Some solutions for n=5 %e A233910 ..2..0....3..2....1..0....2..6....3..2....2..5....5..6....4..6....6..7....0..2 %e A233910 ..1..4....0..4....5..2....4..7....1..5....0..4....7..3....5..2....2..5....1..5 %e A233910 ..2..6....2..5....4..6....2..6....3..6....2..5....4..5....7..3....3..7....4..6 %e A233910 ..4..7....3..7....5..2....4..7....7..5....3..1....6..2....5..2....2..4....1..2 %e A233910 ..2..3....2..4....7..3....2..3....3..6....6..2....4..1....4..6....3..0....4..0 %e A233910 ..5..7....6..7....4..5....5..1....4..2....4..1....6..2....1..2....5..1....2..3 %K A233910 nonn %O A233910 1,1 %A A233910 _R. H. Hardin_, Dec 17 2013 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE