A203438 Number of nX3 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 64, 4124, 142108, 4401184, 168492336, 6975234574, 276131799334, 10691214945638, 418995221883412, 16587140609879948, 656112048511504958, 25898901930434692628, 1022871192914249476820, 40441529880066421243639

Offset

1,2

Comments

Column 3 of A203443

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A262396 A318015 A320401 * A264345 A099369 A249393

Adjacent sequences: A203435 A203436 A203437 * A203439 A203440 A203441

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved