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A224152 Number of n X n 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. 1
2, 12, 89, 574, 3469, 20065, 114537, 650819, 3705824, 21181267, 121617211, 701255335, 4058735341, 23565789117, 137190976378, 800437914689, 4678794395883, 27391873966579, 160581355210547, 942493889605853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A224158.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..23

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A224158.

Sequence in context: A192621 A143923 A079858 * A174356 A355138 A121357

Adjacent sequences:  A224149 A224150 A224151 * A224153 A224154 A224155

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 31 2013

STATUS

approved

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Last modified June 25 10:04 EDT 2022. Contains 354844 sequences. (Running on oeis4.)