A206237 Number of (n+1) X 8 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two equal edges, and new values 0..3 introduced in row major order.

294546, 943584, 3503136, 95322432, 1122086640, 22535636736, 649065145152, 8026428934128, 163621204516992, 4735717646406528, 58825697658136176, 1199179807904946432, 34708074630513355776, 431133538136479945968

Offset

1,1

Comments

Column 7 of A206238.

Links

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

Formula

Empirical: a(n) = a(n-1) +7329*a(n-3) -7329*a(n-4) for n>11.

Example

Some solutions for n=4:
..0..0..1..2..2..3..0..3....0..0..1..1..0..1..1..2....0..0..1..0..0..1..2..0
..0..1..2..2..1..0..0..3....2..2..3..1..1..2..1..1....0..3..0..0..1..2..2..0
..3..2..2..3..0..0..1..2....3..2..2..3..1..1..2..1....1..0..0..3..2..2..0..1
..2..2..3..0..0..1..2..2....0..1..2..2..0..1..1..2....0..0..3..2..2..3..1..1
..1..1..0..0..3..2..2..1....0..0..3..2..2..3..1..1....1..1..2..2..3..1..1..3

Crossrefs

Sequence in context: A178997 A328938 A291637 * A236153 A023351 A258534

Adjacent sequences: A206234 A206235 A206236 * A206238 A206239 A206240

Keyword

nonn

Author

R. H. Hardin, Feb 05 2012

Status

approved