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A250652 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, 34, 109, 316, 859, 2234, 5625, 13816, 33271, 78838, 184309, 425972, 974835, 2211826, 4980721, 11141104, 24772591, 54788078, 120586221, 264241132, 576716779, 1254096874, 2717908969, 5872025576, 12650020839, 27179089894 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A250656

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..69

EXAMPLE

Some solutions for n=4

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

..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0

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

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

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

CROSSREFS

Sequence in context: A067989 A002881 A268803 * A005344 A250763 A264678

Adjacent sequences:  A250649 A250650 A250651 * A250653 A250654 A250655

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 26 2014

STATUS

approved

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Last modified January 24 04:31 EST 2018. Contains 298115 sequences.