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 A232158 #6 Jul 23 2025 06:56:05 %S A232158 14,746,5902,46702,382996,3183932,26694774,223026806,1869037596, %T A232158 15673051556,131274639250,1100535460668,9225695626046,77312726353080, %U A232158 648103682234572,5432428499191068,45531948090605296,381665246488467802 %N A232158 Number of nX5 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal. %C A232158 Column 5 of A232161 %H A232158 R. H. Hardin, <a href="/A232158/b232158.txt">Table of n, a(n) for n = 1..210</a> %e A232158 Some solutions for n=4 %e A232158 ..0..1..0..2..0....0..3..1..0..3....1..0..3..1..3....2..0..2..3..2 %e A232158 ..3..2..3..1..3....1..0..2..1..0....2..1..2..0..2....3..1..0..1..3 %e A232158 ..0..1..2..0..1....2..3..0..2..3....3..0..3..1..0....0..2..3..2..1 %e A232158 ..2..3..1..3..2....1..2..3..1..0....2..1..2..3..2....3..0..1..3..2 %K A232158 nonn %O A232158 1,1 %A A232158 _R. H. Hardin_, Nov 19 2013