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 A189278 #7 Jul 22 2025 11:40:11 %S A189278 1,441,28125,3553225,361199937,39085685401,4145792570105, %T A189278 441979857682489,47045498167288233,5009341586507664025, %U A189278 533335273492176377097,56783742831233576420089,6045707037507297581064681 %N A189278 Number of nX7 array permutations with each element not moved or moved diagonally or antidiagonally by one. %C A189278 Column 7 of A189280 %H A189278 R. H. Hardin, <a href="/A189278/b189278.txt">Table of n, a(n) for n = 1..182</a> %e A189278 Some solutions for 3X7 %e A189278 ..0..1..2..3.12.13..6....0..7..2..3.10.11..6....0..9..2..3..4..5.12 %e A189278 ..7.14..9.16.19..4..5...15.16..1..4..5.18.19...15.14..1.10.19..6.13 %e A189278 ..8.15.10.17.18.11.20...14..9..8.17.12.13.20....8..7.16.17.18.11.20 %K A189278 nonn %O A189278 1,2 %A A189278 _R. H. Hardin_ Apr 19 2011