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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.

A224304 Number of n X n 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

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%I A224304 #7 Jul 23 2025 05:05:08
%S A224304 3,54,1586,45453,1258372,33934344,911404794,24751091876,685844521863,
%T A224304 19455144713950,564670981724616,16727123708223072,504154243224589510,
%U A224304 15415190705591603814
%N A224304 Number of n X n 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.
%C A224304 Diagonal of A224310
%e A224304 Some solutions for n=3
%e A224304 ..1..1..0....0..0..0....0..0..0....0..1..1....2..0..0....1..1..0....0..0..0
%e A224304 ..2..1..1....2..0..0....1..2..0....1..2..0....0..2..1....2..1..1....1..0..0
%e A224304 ..2..1..1....0..1..2....2..1..1....2..1..1....2..2..0....1..1..1....2..1..1
%K A224304 nonn
%O A224304 1,1
%A A224304 _R. H. Hardin_ Apr 03 2013

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