A236012 Number of (n+1)X(2+1) 0..2 arrays colored with the sum of the maximum and minimum values of each 2X2 subblock

306, 1126, 3744, 12544, 41844, 140716, 471308, 1580152, 5294132, 17749124, 59488776, 199400040, 668327516, 2240142740, 7508500744, 25167109004, 84355063048, 282742241052, 947697217680, 3176499039060, 10647009866132

Offset

1,1

Comments

Column 2 of A236018

Links

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

Formula

Empirical: a(n) = 5*a(n-2) +10*a(n-3) +26*a(n-4) +33*a(n-5) +11*a(n-6) -9*a(n-7) -7*a(n-8) -2*a(n-9) for n>11

Example

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

Crossrefs

Sequence in context: A294596 A294710 A206271 * A158589 A030030 A206679

Adjacent sequences: A236009 A236010 A236011 * A236013 A236014 A236015

Keyword

nonn

Author

R. H. Hardin, Jan 18 2014

Status

approved