A269274 Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

1620, 1104264, 474819408, 174924572760, 59587625651904, 19356924219624936, 6090616046325570480, 1872977567099580289656, 566116324214731470647712, 168820920854627863029497352, 49802534018235803452666079376

Offset: 1

Author

R. H. Hardin, Feb 21 2016

Keywords

• nonn

Comments

Column 6 of A269276.

Examples

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

Links

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

Crossrefs

Cf. A269276.

Formula

Empirical: a(n) = 564*a(n-1) -87462*a(n-2) +2257724*a(n-3) -21169617*a(n-4) [phone]*a(n-5) -92236816*a(n-6) for n>7