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 A183724 #7 Oct 06 2015 22:03:46 %S A183724 87,388,1790,14886,272215,7319684,200260149,5355252106,139489865583, %T A183724 3561214845505,89499710973670,2221523267475056,54589402697720455, %U A183724 1330321340313497085,32193928583886647023,774480659129262018036 %N A183724 1/12 the number of (n+1) X 5 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction. %C A183724 Column 4 of A183729. %H A183724 R. H. Hardin, <a href="/A183724/b183724.txt">Table of n, a(n) for n = 1..200</a> %e A183724 Some solutions with the first block increasing clockwise for 3 X 5: %e A183724 ..0..1..2..1..2....2..4..3..2..4....0..1..2..1..2....5..0..4..5..0 %e A183724 ..5..4..3..5..4....1..5..0..1..0....5..4..3..5..3....2..1..3..2..1 %e A183724 ..0..1..2..1..2....2..4..3..2..3....0..1..2..0..2....3..0..4..5..0 %e A183724 ... %e A183724 ...R..R..L..R.......R..L..L..R.......R..R..L..R.......R..L..R..R... %e A183724 ...L..L..R..L.......L..R..R..L.......L..L..R..L.......L..R..L..L... %K A183724 nonn %O A183724 1,1 %A A183724 _R. H. Hardin_, Jan 06 2011