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 A223884 #6 Jul 23 2025 04:38:11 %S A223884 46,3298,187019,8872648,367614623,13705619321,469700382368, %T A223884 15028355082420,454196578645090,13083963708689100,361818451966460877, %U A223884 9660123785787286044,250171942122628486761,6308537121431695167897 %N A223884 Number of nX4 0..2 arrays with row sums unimodal and column sums inverted unimodal. %C A223884 Column 4 of A223885 %H A223884 R. H. Hardin, <a href="/A223884/b223884.txt">Table of n, a(n) for n = 1..15</a> %e A223884 Some solutions for n=3 %e A223884 ..1..1..0..1....0..0..0..1....1..1..1..2....0..0..1..2....0..2..2..1 %e A223884 ..1..1..2..2....0..0..0..2....2..1..2..2....1..2..1..1....0..2..2..1 %e A223884 ..1..1..2..2....1..1..1..2....0..1..2..1....2..2..2..2....0..0..0..2 %K A223884 nonn %O A223884 1,1 %A A223884 _R. H. Hardin_ Mar 28 2013