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

Author

R. H. Hardin, Dec 20 2015

Keywords

• nonn

Comments

Column 3 of A266025.

Examples

			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
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 94

Crossrefs

Cf. A266025.

Formula

Empirical recurrence of order 94 (see link above)