A230678 Number of 4Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

0, 423, 17271, 730503, 37034355, 1844154933, 91258562955, 4522036938501, 224105728666527, 11105653159056021, 550345235166102387, 27272655718068842535, 1351510936295338591335, 66974836192708860686913

Offset: 1

Author

R. H. Hardin, Oct 27 2013

Keywords

• nonn

Comments

Row 4 of A230675

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 64

Formula

Empirical recurrence of order 64 (see link above)