This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A183717 #7 Oct 06 2015 21:59:45 %S A183717 408,5776,71712,954496,12606120,168070828,2239265280,29887741084, %T A183717 398877017736,5325395568832,71097798240000,949288848361824, %U A183717 12674717188992600,169233802374938432,2259618796412155200 %N A183717 1/20 of the number of (n+1) X 8 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease. %C A183717 Column 7 of A183719. %H A183717 R. H. Hardin, <a href="/A183717/b183717.txt">Table of n, a(n) for n = 1..200</a> %e A183717 Some solutions for 3 X 8: %e A183717 ..0..4..0..4..0..4..0..4....1..0..2..0..1..0..1..0....3..0..3..0..4..0..4..0 %e A183717 ..2..3..1..2..1..2..1..2....3..4..3..4..2..4..2..3....2..1..2..1..3..1..3..2 %e A183717 ..0..4..0..4..0..3..0..3....2..0..1..0..1..0..1..0....3..4..3..0..4..0..4..1 %e A183717 ... %e A183717 ...L..R..L..R..L..R..L.......L..R..L..R..L..R..L.......R..L..R..L..R..L..R... %e A183717 ...R..L..R..L..R..L..R.......R..L..R..L..R..L..R.......L..R..L..R..L..R..L... %K A183717 nonn %O A183717 1,1 %A A183717 _R. H. Hardin_, Jan 06 2011