A266035 Number of 3Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors less than itself.

1, 55, 481, 5594, 121029, 2045306, 33026298, 562735444, 9532097947, 160132082576, 2699812308573, 45545430005680, 767636583946670, 12939677383177473, 218153972376875945, 3677676423588950515, 61997693315879549117

Offset

1,2

Comments

Row 3 of A266033.

Links

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

Example

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

Crossrefs

Cf. A266033.

Sequence in context: A145054 A166839 A166827 * A241699 A262103 A138053

Adjacent sequences: A266032 A266033 A266034 * A266036 A266037 A266038

Keyword

nonn

Author

R. H. Hardin, Dec 20 2015

Status

approved