A206115 Number of (n+1) X 6 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

171564, 588840, 2408480, 21702240, 190349280, 1990281312, 18371031840, 163028308320, 1709651647008, 15780716350560, 140041316846880, 1468590764779872, 13555635345131040, 120295491171469920

Offset

1,1

Comments

Column 5 of A206118.

Links

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

Formula

Empirical: a(n) = 859*a(n-3) for n>8.

Example

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

Crossrefs

Sequence in context: A234088 A236498 A246227 * A204730 A376503 A049053

Adjacent sequences: A206112 A206113 A206114 * A206116 A206117 A206118

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved