A250860 Number of (n+2)X(n+2) 0..3 arrays with nondecreasing sum of every three consecutive values in every row and column

262144, 128000000, 250000000000, 1953125000000000, 5744580078125000000, 43254022503125000000000, 833747762130149888000000000, 6537811332601933992442920960000, 104624647058119410496536003666247680

Offset

1,1

Comments

Diagonal of A250868

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Sequence in context: A016785 A017490 A017622 * A016809 A018879 A016905

Adjacent sequences: A250857 A250858 A250859 * A250861 A250862 A250863

Keyword

nonn

Author

R. H. Hardin, Nov 28 2014

Status

approved