A198252 Number of 2nX14 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.

187, 1268648, 10164141586, 84165911962889, 704825868750085006

Offset

1,1

Comments

Column 7 of A198253

Links

Table of n, a(n) for n=1..5.

Example

A solution for n=3
..0..0..0..0..0..0..1..1..1..1..2..2..3..3
..0..1..1..1..1..0..1..4..4..1..2..2..3..3
..0..1..0..0..1..0..1..4..4..1..4..4..2..2
..0..1..0..0..1..0..1..1..1..1..4..4..2..2
..0..1..1..1..1..0..3..3..0..0..2..2..0..0
..0..0..0..0..0..0..3..3..0..0..2..2..0..0

Crossrefs

Sequence in context: A208406 A208413 A198905 * A070257 A204750 A015986

Adjacent sequences: A198249 A198250 A198251 * A198253 A198254 A198255

Keyword

nonn

Author

R. H. Hardin, Oct 22 2011

Status

approved