A266133 Number of 3Xn integer arrays with each element equal to the number of horizontal, diagonal and antidiagonal neighbors exactly one smaller than itself.

1, 20, 77, 117, 278, 1959, 11044, 36730, 123887, 598383, 2919993, 11429093, 43919671, 194434626, 880889564, 3627851352, 14690154222, 63196827262, 276336307138, 1159331148853, 4807640087709, 20468995961561, 88006303609494

Offset

1,2

Comments

Row 3 of A266131.

Links

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

R. H. Hardin, Empirical recurrence of order 77

Formula

Empirical recurrence of order 77 (see link above)

Example

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

Crossrefs

Cf. A266131.

Sequence in context: A066126 A228025 A219941 * A083127 A211613 A292360

Adjacent sequences: A266130 A266131 A266132 * A266134 A266135 A266136

Keyword

nonn

Author

R. H. Hardin, Dec 21 2015

Status

approved