A223832 Number of n X n 0..1 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

1, 2, 9, 48, 249, 1240, 5992, 28369, 132427, 611901, 2805670, 12786249, 57979474, 261797013, 1177774158, 5281497918

Offset: 0

Author

R. H. Hardin, Mar 27 2013

Keywords

• nonn
• more

Examples

			Some solutions for n=3:
..0..1..0....0..0..0....1..1..0....0..0..1....0..0..0....1..1..1....0..0..0
..0..1..1....1..0..0....1..1..0....0..0..1....0..1..0....1..1..1....0..1..0
..1..1..1....1..1..1....1..1..1....0..1..1....0..1..0....1..1..1....0..1..1
		

Crossrefs

Main diagonal of A223838.

Extensions

a(0)=1 prepended by Alois P. Heinz, Feb 14 2024

Name corrected by Andrew Howroyd, Mar 18 2025