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 A223959 #6 Jul 23 2025 04:42:02 %S A223959 84,3906,92734,1718057,30643468,556027700,10269723035,191829887779, %T A223959 3609049327918,68212899813271,1293084011261962,24559344963113337, %U A223959 467028467106529258,8888318851289202078,169249293097773923431 %N A223959 Number of nX6 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing. %C A223959 Column 6 of A223961 %H A223959 R. H. Hardin, <a href="/A223959/b223959.txt">Table of n, a(n) for n = 1..210</a> %e A223959 Some solutions for n=3 %e A223959 ..1..1..1..1..1..2....1..2..2..3..3..3....0..0..0..3..3..3....0..1..1..1..1..2 %e A223959 ..0..1..1..2..2..2....0..2..3..3..3..3....0..0..2..2..3..3....0..0..1..2..3..3 %e A223959 ..0..0..1..3..3..3....1..1..2..3..3..3....1..1..2..2..3..3....0..0..1..3..3..3 %K A223959 nonn %O A223959 1,1 %A A223959 _R. H. Hardin_ Mar 29 2013