A269218 Number of 5Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

0, 103488, 6712704, 474091776, 30541426560, 1910809190712, 116322554833728, 6948456736101264, 408916976890552416, 23782890276972969552, 1370013927382609217472, 78294173211595616892096

Offset: 1

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Row 5 of A269214.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 52

Crossrefs

Cf. A269214.

Formula

Empirical recurrence of order 52 (see link above)