A206114 Number of (n+1) X 5 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

31756, 111552, 520800, 5048352, 21702240, 157206240, 1542266208, 6705992160, 48576728160, 476560258272, 2072151577440, 15010209001440, 147257119806048, 640294837428960, 4638154581444960, 45502450020068832, 197851104765548640

Offset

1,1

Comments

Column 4 of A206118.

Links

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

Formula

Empirical: a(n) = 309*a(n-3) for n>7.

Example

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

Crossrefs

Sequence in context: A154471 A184206 A193742 * A252034 A284519 A183704

Adjacent sequences: A206111 A206112 A206113 * A206115 A206116 A206117

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved