A269212 Number of nX6 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

1620, 360960, 70371048, 11985002256, 1910809190712, 292321215814512, 43468685827935816, 6331185189881558208, 907653167033915932536, 128509758210816109187040, 18012346515317443065043752

Offset: 1

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Column 6 of A269214.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 42

Crossrefs

Cf. A269214.

Formula

Empirical recurrence of order 42 (see link above)