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 A188955 #7 Jul 22 2025 11:28:44 %S A188955 14,3969,1722256,504690017,151700751624,47085945014364, %T A188955 14529766291673016,4473345039125385924,1378237965469881319638, %U A188955 424709806495811992908136,130865875276447905156349870,40323080903656724639859869876 %N A188955 Number of nX4 array permutations with each element moved no more than a city block distance of two. %C A188955 Column 4 of A188958 %H A188955 R. H. Hardin, <a href="/A188955/b188955.txt">Table of n, a(n) for n = 1..52</a> %e A188955 Some solutions for 3X4 %e A188955 ..0..2..5..7....0..2..1..3....0..4..1..2....0..2..3..1....0..2..3..1 %e A188955 ..6..1..9.11....8..4.10..5....6..8..7..3....8..6.11..5....4.10..9..5 %e A188955 .10..4..8..3....9..6.11..7...10.11..5..9...10..4..7..9....8.11..7..6 %K A188955 nonn %O A188955 1,1 %A A188955 _R. H. Hardin_ Apr 14 2011