A203255 Number of n X n 0..7 arrays with every nonzero element less than or equal to some NW, E or S neighbor

1, 64, 716430, 93604950539, 314892411482182670, 40799258353982022255077487

Offset

1,2

Comments

Diagonal of A203262

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
..2..3..0..6....4..5..2..0....6..0..1..0....5..3..2..3....7..2..5..7
..4..6..3..6....6..5..7..3....7..0..5..1....6..4..1..5....7..0..0..7
..2..6..7..6....6..4..7..3....7..0..5..3....7..3..5..5....7..2..7..7
..3..6..7..7....6..6..7..7....7..7..5..5....7..7..4..5....7..7..4..7

Crossrefs

Sequence in context: A214388 A016938 A017010 * A232722 A017094 A350558

Adjacent sequences: A203252 A203253 A203254 * A203256 A203257 A203258

Keyword

nonn

Author

R. H. Hardin Dec 30 2011

Status

approved