A236058 Number of (n+1)X(1+1) 0..2 arrays colored with the difference of the upper median and the minimum in each 2X2 subblock

81, 360, 1616, 7016, 31616, 138988, 620552, 2734804, 12176064, 53818764, 239177944, 1058421796, 4698785664, 20810853180, 92335672184, 409124696372, 1814626300736, 8042404490476, 35664530623384, 158086995532676

Offset

1,1

Comments

Column 1 of A236065

Links

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

Formula

Empirical: a(n) = 16*a(n-3) +173*a(n-4) +268*a(n-5) +1216*a(n-6) +1260*a(n-7) +2128*a(n-8) +1296*a(n-9) -3968*a(n-10) -1024*a(n-11) -12288*a(n-12) +256*a(n-13) -6144*a(n-14)

Example

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

Crossrefs

Sequence in context: A206676 A205520 A236990 * A205513 A017378 A205736

Adjacent sequences: A236055 A236056 A236057 * A236059 A236060 A236061

Keyword

nonn

Author

R. H. Hardin, Jan 18 2014

Status

approved