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 A223883 #6 Jul 23 2025 04:38:04 %S A223883 22,564,11250,187019,2718572,35673854,431939504,4901224903, %T A223883 52724142720,542458862253,5374667759935,51561822161831, %U A223883 481068900940649,4380767665324085,39052633428110362,341657170980967653 %N A223883 Number of nX3 0..2 arrays with row sums unimodal and column sums inverted unimodal. %C A223883 Column 3 of A223885 %H A223883 R. H. Hardin, <a href="/A223883/b223883.txt">Table of n, a(n) for n = 1..47</a> %e A223883 Some solutions for n=3 %e A223883 ..1..2..0....1..0..1....1..1..1....0..1..0....1..0..2....1..2..1....1..0..2 %e A223883 ..1..1..1....1..1..0....0..2..2....1..2..1....2..1..0....2..0..1....1..2..0 %e A223883 ..2..1..0....0..0..1....1..0..2....2..0..1....1..0..2....1..2..0....0..1..2 %K A223883 nonn %O A223883 1,1 %A A223883 _R. H. Hardin_ Mar 28 2013