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 A278732 #6 Jun 17 2022 14:54:20 %S A278732 1128,712406,506031118,374757577056,268284486351027, %T A278732 183338866913973336,119979123054325787300,75059724220196821830976, %U A278732 44560888984275849849896791,24904255595102014593384961783 %N A278732 Number of n X 6 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. %C A278732 Column 6 of A278734. %H A278732 R. H. Hardin, <a href="/A278732/b278732.txt">Table of n, a(n) for n = 1..19</a> %e A278732 Some solutions for n=1 %e A278732 ..1..0..0..0..0..1. .1..1..0..2..2..2. .0..3..3..3..3..0. .0..0..3..3..3..1 %Y A278732 Cf. A278734. %K A278732 nonn %O A278732 1,1 %A A278732 _R. H. Hardin_, Nov 27 2016