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 A203488 #6 Mar 26 2023 10:23:06 %S A203488 48,3348,170868,8518564,421158558,20726134056,1022868051652, %T A203488 50561285393908,2503295874466950,124208845614214498, %U A203488 6167894219771885242,306989800251437858776,15307714522320704176494,764702726505274412235480 %N A203488 Number of n X 5 0..2 arrays with row sums equal and column sums unequal to adjacent columns. %C A203488 Column 5 of A203491. %e A203488 Some solutions for n=5 %e A203488 ..0..0..2..0..0....1..0..2..2..0....2..0..2..2..0....1..0..0..0..0 %e A203488 ..0..0..1..1..0....2..2..1..0..0....1..0..1..2..2....1..0..0..0..0 %e A203488 ..0..1..0..0..1....2..1..2..0..0....0..2..0..2..2....1..0..0..0..0 %e A203488 ..0..1..0..1..0....1..0..1..1..2....1..1..0..2..2....0..0..0..0..1 %e A203488 ..1..0..1..0..0....1..2..2..0..0....0..2..0..2..2....0..0..1..0..0 %Y A203488 Cf. A203491. %K A203488 nonn %O A203488 1,1 %A A203488 _R. H. Hardin_, Jan 02 2012