A233158 Number of 5Xn 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally or antidiagonally.

243, 1536, 15552, 157464, 1658232, 17587584, 187446312, 2000708640, 21367730664, 228251103552, 2438324338248, 26048163809952, 278268995799144, 2972714012485056, 31757156984626632, 339258043287199008

Offset: 1

Author

R. H. Hardin, Dec 05 2013

Keywords

• nonn

Comments

Row 5 of A233155

Examples

			Some solutions for n=4
..1..2..2..1....1..2..2..1....0..1..2..1....1..0..1..0....1..2..1..2
..2..1..2..1....2..1..2..1....2..1..0..1....0..0..1..2....2..2..2..2
..0..1..2..2....0..1..2..2....0..1..2..2....1..0..1..2....2..2..2..2
..2..1..2..2....2..2..2..1....2..1..2..1....1..2..2..2....2..2..2..1
..2..1..2..1....1..2..2..2....0..1..2..2....1..2..2..2....1..2..2..1
		

Links

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

Formula

Empirical: a(n) = 16*a(n-1) -64*a(n-2) +76*a(n-3) +17*a(n-4) -84*a(n-5) +48*a(n-6) -8*a(n-7) for n>11