A236014 Number of (n+1)X(4+1) 0..2 arrays colored with the sum of the maximum and minimum values of each 2X2 subblock

4672, 12544, 34288, 95848, 267424, 771564, 2218212, 6382872, 18265360, 52177252, 149258712, 427853252, 1226410112, 3513633704, 10058786964, 28806493432, 82512239868, 236383009160, 677059152856, 1939300994548, 5554357282184

Offset

1,1

Comments

Column 4 of A236018

Links

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

Formula

Empirical: a(n) = 4*a(n-2) +3*a(n-3) +24*a(n-4) +21*a(n-5) +28*a(n-6) -64*a(n-7) -199*a(n-8) -396*a(n-9) -578*a(n-10) -30*a(n-11) -136*a(n-12) -192*a(n-13) for n>16

Example

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

Crossrefs

Sequence in context: A204489 A252127 A188364 * A202431 A066731 A230487

Adjacent sequences: A236011 A236012 A236013 * A236015 A236016 A236017

Keyword

nonn

Author

R. H. Hardin, Jan 18 2014

Status

approved