A236646 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock

81, 484, 2932, 17824, 108272, 655100, 3970468, 24093844, 146112996, 885471428, 5368434004, 32556604804, 197396153396, 1196688738212, 7255631320212, 43993941478852, 266737613009204, 1617205521101540, 9805281128974548

Offset

1,1

Comments

Column 1 of A236651

Links

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

Formula

Empirical: a(n) = a(n-1) +4*a(n-2) +60*a(n-3) +500*a(n-4) +608*a(n-5) +1064*a(n-6) +512*a(n-7) -14672*a(n-8) -18640*a(n-9) -27776*a(n-10) -53248*a(n-11)

Example

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

Crossrefs

Sequence in context: A295018 A250613 A237077 * A205246 A205239 A236427

Adjacent sequences: A236643 A236644 A236645 * A236647 A236648 A236649

Keyword

nonn

Author

R. H. Hardin, Jan 29 2014

Status

approved