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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.

A224051 Number of n X n 0..2 arrays with rows and columns unimodal and antidiagonals nondecreasing.

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%I A224051 #7 Jul 23 2025 04:57:55
%S A224051 3,54,1232,27246,568107,11231300,212819499,3903149379,69818587635,
%T A224051 1225169731998
%N A224051 Number of n X n 0..2 arrays with rows and columns unimodal and antidiagonals nondecreasing.
%C A224051 Diagonal of A224057
%e A224051 Some solutions for n=3
%e A224051 ..2..1..1....0..1..0....0..0..0....2..1..0....1..1..0....2..0..0....0..0..0
%e A224051 ..2..1..1....1..1..1....2..2..0....2..0..0....1..2..0....2..1..1....0..0..2
%e A224051 ..1..2..1....1..1..0....2..2..2....0..0..0....2..2..1....2..2..1....1..2..0
%K A224051 nonn
%O A224051 1,1
%A A224051 _R. H. Hardin_ Mar 30 2013

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