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A223943 Number of n X n 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing 0
2, 9, 54, 321, 1821, 9919, 52532, 272997, 1401993, 7150718, 36352875, 184670276, 938969921, 4783571827, 24431153268, 125119394092 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A223949

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=3

..0..1..1....0..0..0....0..0..0....0..1..1....0..0..0....0..0..0....0..1..1

..0..0..0....0..0..1....1..1..1....0..0..1....0..0..1....0..1..1....0..0..0

..0..0..0....0..0..1....0..0..1....0..0..1....0..0..0....0..0..1....0..0..1

CROSSREFS

Sequence in context: A218945 A233338 A073986 * A241125 A089436 A000168

Adjacent sequences:  A223940 A223941 A223942 * A223944 A223945 A223946

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 29 2013

STATUS

approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)