A203334 Number of nX4 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 161, 27056, 2224079, 156011082, 12492984999, 1066362412766, 89890925664626, 7505491171476277, 629157090925887686, 52957694264102993755, 4460957940319875997958, 375762142634174553990100

Offset

1,2

Comments

Column 4 of A203338

Links

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

Example

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

Crossrefs

Sequence in context: A207232 A207225 A207012 * A272355 A278891 A232294

Adjacent sequences: A203331 A203332 A203333 * A203335 A203336 A203337

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved