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

1,1

Comments

Column 4 of A203835

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)

Example

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

Crossrefs

Sequence in context: A058003 A202098 A247261 * A014799 A031573 A031753

Adjacent sequences: A203828 A203829 A203830 * A203832 A203833 A203834

Keyword

nonn

Author

R. H. Hardin Jan 06 2012

Status

approved