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A233355 Number of (2+1)X(n+1) 0..3 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..2+1} nondecreasing 1
556, 11562, 190529, 2607957, 30702571, 318690200, 2971433937, 25246347927, 197700498771, 1440116403312, 9832683394775, 63328463314930, 386836067185308, 2251495571063245, 12536510744566039, 67014386522917619, 344974005024375867 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A233353

LINKS

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

EXAMPLE

Some solutions for n=2

..3..0..0....0..2..0....0..0..2....1..2..0....0..0..0....0..0..3....0..2..2

..3..0..2....0..3..0....1..1..3....1..1..3....0..0..2....1..2..1....2..0..2

..1..3..3....1..0..3....0..2..3....0..3..3....1..1..2....0..2..3....2..3..3

CROSSREFS

Sequence in context: A261432 A104809 A233728 * A177331 A289564 A319061

Adjacent sequences:  A233352 A233353 A233354 * A233356 A233357 A233358

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 07 2013

STATUS

approved

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Last modified October 19 22:05 EDT 2021. Contains 348095 sequences. (Running on oeis4.)