A203831 Number of (n+1)X5 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

5625, 151659, 4238721, 119606211, 3383285769, 95763046491, 2710984443345, 76749227497395, 2172829037910489, 61514609224652235, 1741531281545538081, 49304251065416837283, 1395845890054082693289, 39517602012270762571323

Offset: 1

Author

R. H. Hardin Jan 06 2012

Keywords

• nonn

Comments

Column 4 of A203835

Examples

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

Links

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

Formula

Empirical: a(n) = 31*a(n-1) -24*a(n-2) -1612*a(n-3) +3816*a(n-4) +1152*a(n-5) -2784*a(n-6) +256*a(n-7)