A230172 Number of n X 4 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

9, 1407, 78849, 4722977, 284444079, 17072965263, 1027868078181, 61861526624839, 3721702070420191, 223920929460093089, 13473042937456532657, 810647385075641076549, 48774886700839338028985, 2934683063063203660000047, 176573841926955569266738003, 10624082602448862037038864007

Offset: 1

Author

R. H. Hardin, Oct 11 2013

Keywords

• nonn

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 81

Crossrefs

Column 4 of A230176.

Formula

Empirical recurrence of order 81 (see link above).