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 A223060 #6 Mar 09 2023 15:32:57 %S A223060 187,255045,412602889,677531592132,1115636153544055, %T A223060 1837966217755803448,3028264612325675509047,4989509449716896144976736, %U A223060 8220974979731088191278751151,13545313950246233778034214834568 %N A223060 Number of n X 6 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order. %C A223060 Column 6 of A223062. %H A223060 R. H. Hardin, <a href="/A223060/b223060.txt">Table of n, a(n) for n = 1..111</a> %e A223060 Some solutions for n=3 %e A223060 ..0..1..0..2..3..0....0..1..0..1..2..3....0..1..0..2..0..3....0..1..0..1..2..3 %e A223060 ..0..1..0..1..2..2....0..1..0..1..2..1....0..1..0..1..0..1....0..1..0..3..2..1 %e A223060 ..0..2..1..3..1..0....0..2..2..2..0..3....0..2..2..1..3..3....0..2..3..0..2..3 %Y A223060 Cf. A223062. %K A223060 nonn %O A223060 1,1 %A A223060 _R. H. Hardin_, Mar 13 2013