A265983 Number of 3Xn integer arrays with each element equal to the number of horizontal, diagonal and antidiagonal neighbors less than itself.

1, 123, 1267, 11573, 320641, 8061815, 133236904, 2362292183, 49521535540, 1008039449030, 19153337324312, 370373113285491, 7361128495277353, 145077471406639845, 2828271548979912832, 55370542134158497160

Offset

1,2

Comments

Row 3 of A265981.

Links

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

Example

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

Crossrefs

Cf. A265981.

Sequence in context: A167231 A174173 A116935 * A103504 A324627 A259907

Adjacent sequences: A265980 A265981 A265982 * A265984 A265985 A265986

Keyword

nonn

Author

R. H. Hardin, Dec 19 2015

Status

approved