A206117 Number of (n+1) X 8 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

5538732, 16072760, 59892000, 1542266208, 18371031840, 373319837280, 10214794664928, 127417290645600, 2621909765268000, 72022987084456800, 901477331317620000, 18550011589271100000, 509562633622531860000

Offset

1,1

Comments

Column 7 of A206118.

Links

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

Formula

Empirical: a(n) = 7075*a(n-3) for n>10.

Example

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

Crossrefs

Sequence in context: A254188 A253800 A158760 * A237973 A204528 A092019

Adjacent sequences: A206114 A206115 A206116 * A206118 A206119 A206120

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved