A232888 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*x(i,j), i=1..2+1} nondecreasing

578, 12920, 235936, 3695555, 51264185, 644182816, 7460893864, 80676054597, 822720588842, 7976326518730, 73999362424318, 660467507825188, 5696611476327209, 47660470235252790, 388033944154755006

Offset

1,1

Comments

Row 2 of A232886

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for n=2
..1..2..2....0..0..0....2..2..2....2..2..1....0..1..1....0..3..1....2..0..3
..3..1..1....1..1..1....2..2..2....1..3..2....2..0..2....3..0..3....0..3..2
..1..2..3....2..3..3....1..2..3....3..2..3....2..3..3....2..3..3....0..3..3

Crossrefs

Sequence in context: A252385 A158369 A366067 * A035754 A107550 A097768

Adjacent sequences: A232885 A232886 A232887 * A232889 A232890 A232891

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved