A236698 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the lower median minus the upper median of every 2X2 subblock

81, 426, 2285, 12076, 64277, 340944, 1814328, 9631020, 51194672, 271870052, 1444934368, 7675375072, 40784882096, 216663323008, 1151214951968, 6116060404960, 32495699325440, 172643724320704, 917267767532288

Offset

1,1

Comments

Column 1 of A236704

Links

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

Formula

Empirical: a(n) = 8*a(n-3) +352*a(n-4) +916*a(n-5) +3728*a(n-6) +10464*a(n-7) +16592*a(n-8) +26464*a(n-9) +20624*a(n-10) +6240*a(n-11) +2048*a(n-12) -5632*a(n-13)

Example

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

Crossrefs

Sequence in context: A236610 A236704 A236604 * A235421 A236282 A235417

Adjacent sequences: A236695 A236696 A236697 * A236699 A236700 A236701

Keyword

nonn

Author

R. H. Hardin, Jan 30 2014

Status

approved