A230186 Number of 3Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value 2-x(i,j).

0, 33, 231, 3411, 44487, 596973, 7957785, 106248147, 1418070843, 18928121865, 252644742093, 3372208415751, 45010959441111, 600789299156241, 8019108619691037, 107036033204372163, 1428676544542445175

Offset: 1

Author

R. H. Hardin, Oct 11 2013

Keywords

• nonn

Comments

Row 3 of A230184

Examples

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

Links

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

Formula

Empirical: a(n) = 9*a(n-1) +59*a(n-2) +17*a(n-3) -361*a(n-4) -569*a(n-5) +530*a(n-6) +2304*a(n-7) +1442*a(n-8) -3272*a(n-9) -5911*a(n-10) -927*a(n-11) +5899*a(n-12) +3415*a(n-13) +293*a(n-14) -3915*a(n-15) -688*a(n-16) +770*a(n-17) +146*a(n-18) +984*a(n-19) -112*a(n-20) +176*a(n-21) for n>23