A237326 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

320, 1660, 8588, 45996, 242644, 1279474, 6740992, 36117846, 190631336, 1005363146, 5297587660, 28385155912, 149821450268, 790147365438, 4163579409000, 22309054217762, 117750984236192, 621010645500502

Offset

1,1

Comments

Column 2 of A237332

Links

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

Formula

Empirical: a(n) = 886*a(n-4) -81785*a(n-8) +2512316*a(n-12) -31242554*a(n-16) +155011102*a(n-20) -288082700*a(n-24) +141692576*a(n-28) +6787392*a(n-32) for n>34

Example

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

Crossrefs

Sequence in context: A110289 A258681 A258674 * A055863 A168636 A374608

Adjacent sequences: A237323 A237324 A237325 * A237327 A237328 A237329

Keyword

nonn

Author

R. H. Hardin, Feb 06 2014

Status

approved