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A223926 Number of n X n 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

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%I A223926 #7 Jul 23 2025 04:39:37
%S A223926 3,54,1116,21334,386495,6621074,108796955,1735753333,27144561576
%N A223926 Number of n X n 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.
%C A223926 Diagonal of A223933
%e A223926 Some solutions for n=3
%e A223926 ..2..1..1....0..1..0....0..2..1....1..0..0....0..0..0....0..0..0....0..0..0
%e A223926 ..0..2..2....1..1..2....2..2..2....0..1..0....0..0..2....0..2..2....1..0..0
%e A223926 ..0..0..2....1..2..2....2..2..2....0..1..1....1..2..2....1..1..2....1..1..2
%K A223926 nonn
%O A223926 1,1
%A A223926 _R. H. Hardin_ Mar 29 2013

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