A237229 Number of (n+1)X(3+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

928, 3284, 12014, 29456, 97862, 269844, 926086, 2450048, 8256930, 22301740, 75579798, 202641416, 684983946, 1842571444, 6234175914, 16748300216, 56643845034, 152257571812, 515024932506, 1384075694696, 4681456782942

Offset

1,1

Comments

Column 3 of A237234

Links

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

Formula

Empirical: a(n) = 5*a(n-2) +42*a(n-4) -21*a(n-6) -207*a(n-8) for n>13

Example

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

Crossrefs

Sequence in context: A257485 A255106 A253039 * A219526 A249535 A350702

Adjacent sequences: A237226 A237227 A237228 * A237230 A237231 A237232

Keyword

nonn

Author

R. H. Hardin, Feb 05 2014

Status

approved