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 A209463 #9 Jul 22 2025 21:44:24 %S A209463 203,192994,613535578,2694404849980,12804264249973850, %T A209463 61881181615562063430,300152638733732557375867, %U A209463 1457000130370973265198610110,7073741096426369034220117508698 %N A209463 Number of nX6 0..6 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..6 introduced in row major order. %C A209463 Column 6 of A209465 %H A209463 R. H. Hardin, <a href="/A209463/b209463.txt">Table of n, a(n) for n = 1..59</a> %e A209463 Some.solutions.for.n=4 %e A209463 ..0..0..1..2..3..1....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..1..0 %e A209463 ..1..4..4..2..0..0....1..2..1..2..1..2....1..2..1..2..1..2....1..2..3..1..3..3 %e A209463 ..1..0..1..2..1..2....2..0..1..0..1..0....2..0..1..3..1..3....0..1..1..2..1..4 %e A209463 ..1..4..0..1..3..1....1..0..2..0..3..0....3..0..2..1..4..1....2..2..3..1..3..1 %K A209463 nonn %O A209463 1,1 %A A209463 _R. H. Hardin_ Mar 09 2012