A236445 Number of (n+1)X(1+1) 0..3 arrays colored with the difference of the maximum and minimum in each 2X2 subblock

256, 2116, 17258, 136208, 1080984, 8564392, 67897642, 538065184, 4265291002, 33804568568, 267953875076, 2123741832432, 16833511636310, 133421518052528, 1057529601925106, 8382006062940352, 66437217185516568, 526585866692093976

Offset

1,1

Comments

Column 1 of A236451

Links

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

Formula

Empirical: a(n) = 32*a(n-2) +90*a(n-3) +846*a(n-4) +2418*a(n-5) +3809*a(n-6) +5178*a(n-7) +3384*a(n-8) +3328*a(n-9) +1024*a(n-10) +512*a(n-11) for n>13

Example

Some solutions for n=4
..2..0....2..0....1..3....0..3....0..0....2..3....1..2....2..3....1..0....2..0
..0..1....3..1....1..0....1..1....1..3....3..3....2..3....2..0....0..1....1..2
..1..0....3..2....2..2....0..0....2..3....1..2....0..0....1..2....2..0....1..1
..1..2....1..0....3..2....3..2....1..0....1..2....0..0....1..1....3..1....1..1
..1..1....2..0....0..1....1..1....0..0....0..0....2..3....0..2....1..2....3..3

Crossrefs

Sequence in context: A221487 A014711 A236451 * A205954 A205466 A205459

Adjacent sequences: A236442 A236443 A236444 * A236446 A236447 A236448

Keyword

nonn

Author

R. H. Hardin, Jan 26 2014

Status

approved