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%I #7 Dec 27 2023 00:18:23
%S 2,9,54,321,1821,9919,52532,272997,1401993,7150718,36352875,184670276,
%T 938969921,4783571827,24431153268,125119394092
%N Number of n X n 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.
%C Diagonal of A223949.
%e Some solutions for n=3
%e ..0..1..1....0..0..0....0..0..0....0..1..1....0..0..0....0..0..0....0..1..1
%e ..0..0..0....0..0..1....1..1..1....0..0..1....0..0..1....0..1..1....0..0..0
%e ..0..0..0....0..0..1....0..0..1....0..0..1....0..0..0....0..0..1....0..0..1
%Y Cf. A223949.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 29 2013
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