A203270 Number of n X n 0..5 arrays with every nonzero element less than or equal to some NW, E or S neighbor

1, 36, 107968, 2590250609, 1126396980640358, 11855913847814563858262, 2882997102757569110567142289632

Offset

1,2

Comments

Diagonal of A203277

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=4
..4..3..5..5....3..5..0..3....3..5..3..1....4..2..5..2....1..2..3..4
..4..2..5..5....0..5..5..3....5..5..4..1....4..2..5..2....1..2..1..4
..4..1..1..3....4..5..5..3....0..5..1..1....4..5..5..4....0..2..4..4
..4..4..0..0....3..4..1..5....5..5..5..0....1..5..5..4....0..0..3..4

Crossrefs

Sequence in context: A357804 A097573 A133015 * A185960 A334409 A216832

Adjacent sequences: A203267 A203268 A203269 * A203271 A203272 A203273

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved