A205939 Number of (n+1) X 4 0..3 arrays with no 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward or upward neighbors.

12712, 81864, 754704, 6705048, 59081744, 519841120, 4654724592, 41664657416, 370163231264, 3293397673768, 29454711836216, 262833979249240, 2340418899019728, 20866728142257848, 186303761325591116

Offset

1,1

Comments

Column 3 of A205944.

Links

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

Example

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

Crossrefs

Sequence in context: A105655 A124411 A256809 * A278585 A288355 A163573

Adjacent sequences: A205936 A205937 A205938 * A205940 A205941 A205942

Keyword

nonn

Author

R. H. Hardin, Feb 01 2012

Status

approved