A203396 Number of nX7 0..3 arrays with every nonzero element less than or equal to some NW, E or S neighbor

1, 661595, 4711784187, 14710444493905, 45159146324783578, 154961643794311169996, 535800823449864962697227, 1822334263711036605145936237, 6186928248710299499016512591407

Offset

1,2

Comments

Column 7 of A203397

Links

R. H. Hardin, Table of n, a(n) for n = 1..181

Example

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

Crossrefs

Sequence in context: A254495 A254488 A253860 * A234688 A235210 A209596

Adjacent sequences: A203393 A203394 A203395 * A203397 A203398 A203399

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved