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