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 A216336 #6 Jul 22 2025 23:30:48 %S A216336 2,42,2440,373780,87852160,37060650272,20358402201792, %T A216336 17131843186425504,17423570614012565376,24860319276726031245440, %U A216336 41082882676098706722895360,90015726535715347904300537088,222247072052822589353800809064448 %N A216336 Number of horizontal and antidiagonal neighbor colorings of the even squares of an nX6 array with new integer colors introduced in row major order. %C A216336 Column 6 of A216338 %H A216336 R. H. Hardin, <a href="/A216336/b216336.txt">Table of n, a(n) for n = 1..26</a> %e A216336 Some solutions for n=4 %e A216336 ..0..x..1..x..0..x....0..x..1..x..0..x....0..x..1..x..2..x....0..x..1..x..0..x %e A216336 ..x..2..x..3..x..1....x..2..x..3..x..4....x..0..x..3..x..4....x..2..x..3..x..2 %e A216336 ..1..x..0..x..2..x....1..x..5..x..0..x....4..x..5..x..1..x....1..x..4..x..0..x %e A216336 ..x..3..x..4..x..3....x..4..x..5..x..2....x..6..x..3..x..2....x..0..x..2..x..0 %K A216336 nonn %O A216336 1,1 %A A216336 _R. H. Hardin_ Sep 04 2012