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A250722 Number of (n+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. 1
9, 46, 208, 885, 3605, 14437, 57397, 228455, 912438, 3661515, 14755226, 59674645, 241996099, 983339540, 4001469252, 16299591564, 66441841973, 270971703338, 1105502740041, 4511347592849, 18413367334909, 75165710188419 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A250729.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..30

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A250729.

Sequence in context: A085385 A217152 A081193 * A250776 A054140 A307955

Adjacent sequences:  A250719 A250720 A250721 * A250723 A250724 A250725

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 27 2014

STATUS

approved

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Last modified September 29 01:05 EDT 2022. Contains 357082 sequences. (Running on oeis4.)