A236013 Number of (n+1)X(3+1) 0..2 arrays colored with the sum of the maximum and minimum values of each 2X2 subblock

1276, 3744, 13750, 34288, 110274, 313060, 1059410, 2852400, 9387554, 25937988, 86158450, 235806192, 779991734, 2143722636, 7102177066, 19487328696, 64517987030, 177151900644, 586666746358, 1610397251352, 5332485179726

Offset

1,1

Comments

Column 3 of A236018

Links

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

Formula

Empirical: a(n) = 5*a(n-2) +42*a(n-4) -21*a(n-6) -207*a(n-8) for n>13

Example

Some solutions for n=5
..1..1..2..0....1..2..1..0....1..1..0..2....1..1..0..0....1..2..0..1
..1..1..2..1....0..1..1..2....1..1..0..0....1..1..0..0....2..2..1..0
..0..0..1..2....1..1..1..2....1..2..1..1....2..2..1..1....0..1..2..2
..2..1..0..1....1..1..0..1....0..1..1..1....2..2..1..1....0..0..1..1
..1..2..1..1....2..2..1..0....0..1..1..0....1..1..0..0....2..1..1..1
..0..2..2..0....2..2..2..0....0..2..2..2....2..0..0..0....2..2..0..0

Crossrefs

Sequence in context: A325604 A230758 A318201 * A282440 A211685 A210365

Adjacent sequences: A236010 A236011 A236012 * A236014 A236015 A236016

Keyword

nonn

Author

R. H. Hardin, Jan 18 2014

Status

approved