A185537 1/6 the number of nX4 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

6, 1155, 127570, 17526450, 2241330570, 295044602325, 38418831900875, 5024252800116630, 655951718326130130, 85695581922306489845, 11192649881286988768850, 1462013677990229903804335

Offset

1,1

Comments

Column 4 of A185540

Links

R. H. Hardin, Table of n, a(n) for n = 1..48

Example

Some solutions for 3X4 with a(1,1)=0
..0..5..5..4....0..2..5..5....0..0..2..4....0..1..2..2....0..0..0..2
..0..1..5..4....0..2..3..5....1..3..2..4....0..1..0..4....3..2..2..2
..1..1..3..3....2..2..3..3....1..3..4..4....5..5..0..4....3..5..5..5

Crossrefs

Sequence in context: A190351 A267071 A219165 * A113159 A159717 A160857

Adjacent sequences: A185534 A185535 A185536 * A185538 A185539 A185540

Keyword

nonn

Author

R. H. Hardin Jan 30 2011

Status

approved