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A233298 Number of (n+1)X(2+1) 0..1 arrays x(i,j) with row sums sum{x(i,j), j=1..2+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..n+1} nondecreasing 0
13, 42, 141, 502, 1739, 5964, 20185, 67609, 224165, 737347, 2407911, 7814616, 25223004, 81015137, 259099567, 825507109, 2621224089, 8298060296, 26197890927, 82506334112, 259260476024 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A233301

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A159527 A139277 A162265 * A243028 A242544 A301539

Adjacent sequences: A233295 A233296 A233297 * A233299 A233300 A233301

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 07 2013

STATUS

approved

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Last modified December 3 13:56 EST 2022. Contains 358534 sequences. (Running on oeis4.)