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A233303 Number of (3+1)X(n+1) 0..1 arrays x(i,j) with row sums sum{x(i,j), j=1..n+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..3+1} nondecreasing 2
31, 141, 567, 1986, 6292, 18205, 48913, 123084, 292784, 662512, 1434508, 2985639, 5997455, 11666253, 22040149, 40541549, 72770415, 127706638, 219494579, 370035418, 612722058, 997726253, 1599424522, 2526675993, 3936943281 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A233301, row 4 of A267245.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..66

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Sequence in context: A141950 A201960 A182916 * A185521 A228261 A185513

Adjacent sequences:  A233300 A233301 A233302 * A233304 A233305 A233306

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 07 2013

STATUS

approved

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Last modified May 19 12:09 EDT 2022. Contains 353833 sequences. (Running on oeis4.)