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 A223960 #6 Jul 23 2025 04:42:20 %S A223960 120,7470,217144,4500818,85350934,1629022329,31770135236,629825651180, %T A223960 12620835427126,254719515611821,5165793380135728,105110696722615853, %U A223960 2143594088287821599,43784293043682987873,895295525455930993505 %N A223960 Number of nX7 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing. %C A223960 Column 7 of A223961 %H A223960 R. H. Hardin, <a href="/A223960/b223960.txt">Table of n, a(n) for n = 1..210</a> %e A223960 Some solutions for n=3 %e A223960 ..0..0..0..0..2..3..3....0..0..0..0..0..2..2....0..0..0..0..0..1..2 %e A223960 ..0..1..1..1..2..3..3....0..0..1..1..2..2..2....0..0..1..2..2..2..3 %e A223960 ..0..0..1..1..1..3..3....0..2..2..2..2..2..3....0..0..1..2..2..3..3 %K A223960 nonn %O A223960 1,1 %A A223960 _R. H. Hardin_ Mar 29 2013