A229842 Number of nX3 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value 2-x(i,j).

3, 81, 987, 13401, 178311, 2381469, 31783299, 424240833, 5662582239, 75582071565, 1008840783171, 13465626160209, 179734091085543, 2399022766771749, 32021249796760479, 427407548197383945, 5704874525707845543

Offset: 1

Author

R. H. Hardin, Oct 01 2013

Keywords

• nonn

Comments

Column 3 of A229847

Examples

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

Links

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

Formula

Empirical: a(n) = 10*a(n-1) +44*a(n-2) +20*a(n-3) -122*a(n-4) -303*a(n-5) -129*a(n-6) +244*a(n-7) +526*a(n-8) -74*a(n-9) -220*a(n-10) -225*a(n-11) +96*a(n-12) +172*a(n-13) -50*a(n-14) +44*a(n-15)