A236050 Number of (n+1)X(3+1) 0..2 arrays colored with the difference of the maximum and minimum in each 2X2 subblock

1112, 3516, 12686, 32608, 103986, 297316, 981554, 2710176, 8760338, 24641412, 80155474, 224030592, 726570374, 2036634156, 6612233002, 18513979560, 60080465798, 168303117636, 546265954102, 1529959079880, 4965452373566

Offset

1,1

Comments

Column 3 of A236055

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=4
..2..0..0..2....1..2..1..0....2..0..0..2....2..2..0..0....2..2..0..1
..0..1..1..2....0..1..1..2....0..1..1..1....2..1..1..0....1..2..1..0
..0..1..1..2....1..1..1..2....1..1..1..0....1..0..1..2....0..1..1..2
..2..1..0..0....1..1..0..0....1..1..2..1....1..1..2..2....0..1..1..2
..1..2..0..1....1..2..0..0....1..0..1..2....0..2..1..0....2..0..0..0

Crossrefs

Sequence in context: A274831 A154805 A203897 * A213979 A225351 A066484

Adjacent sequences: A236047 A236048 A236049 * A236051 A236052 A236053

Keyword

nonn

Author

R. H. Hardin, Jan 18 2014

Status

approved