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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.

A223955 Number of n X n 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

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%I A223955 #7 Jul 23 2025 04:41:08
%S A223955 4,85,3471,176893,9779558,556027700,31770135236,1805384910990,
%T A223955 101606391647751,5657068092397559,311737148953336261,
%U A223955 17023765723406625834,922742812050648219706
%N A223955 Number of n X n 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.
%C A223955 Diagonal of A223961
%e A223955 Some solutions for n=3
%e A223955 ..0..1..2....0..0..0....0..2..2....1..2..3....0..0..3....1..1..1....0..3..3
%e A223955 ..1..2..2....0..0..1....2..2..2....1..1..2....3..3..3....2..3..3....0..0..3
%e A223955 ..2..2..2....1..2..3....0..2..2....0..1..2....2..3..3....2..2..3....0..0..1
%K A223955 nonn
%O A223955 1,1
%A A223955 _R. H. Hardin_ Mar 29 2013

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