A266020 Number of nX3 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself.

4, 14, 33, 91, 316, 1045, 3394, 11102, 36842, 122052, 402200, 1324463, 4373322, 14443892, 47671729, 157325046, 519327402, 1714258173, 5658200079, 18676187387, 61646837018, 203484164638, 671655360694, 2216987948652, 7317807541625

Offset

1,1

Comments

Column 3 of A266025.

Links

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

R. H. Hardin, Empirical recurrence of order 94

Formula

Empirical recurrence of order 94 (see link above)

Example

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

Crossrefs

Cf. A266025.

Sequence in context: A322009 A228272 A011935 * A351930 A185441 A032645

Adjacent sequences: A266017 A266018 A266019 * A266021 A266022 A266023

Keyword

nonn

Author

R. H. Hardin, Dec 20 2015

Status

approved