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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.

A223912 Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.

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%I A223912 #7 Oct 01 2021 17:18:57
%S A223912 3,36,666,14123,319156,7526024,183720802,4620831232,119279565646,
%T A223912 3149193338709,84781194626719,2321280055370071,64493788929080253,
%U A223912 1814933493902398900,51651065174273533812
%N A223912 Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.
%C A223912 Diagonal of A223918.
%e A223912 Some solutions for n=3
%e A223912 ..0..0..1....2..1..0....1..1..2....0..0..0....0..0..0....1..0..0....0..1..0
%e A223912 ..1..1..1....2..1..0....1..1..2....1..0..0....0..1..0....1..1..0....2..1..1
%e A223912 ..1..2..1....2..2..2....1..2..2....1..0..0....1..1..0....2..1..0....2..1..1
%Y A223912 Cf. A223918.
%K A223912 nonn
%O A223912 1,1
%A A223912 _R. H. Hardin_ Mar 29 2013

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