A205950 Number of (n+1) X 4 0..3 arrays with no 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors or the same number of counterclockwise edge increases as its vertical neighbors.

17920, 310912, 5550256, 101702648, 1912957100, 36783376600, 718097911212, 14168783055608, 281683319581364, 5628530205351848, 112878301213615480, 2269166138679395320, 45695383178079335324, 921207719717378895736

Offset

1,1

Comments

Column 3 of A205954.

Links

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

Example

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

Crossrefs

Sequence in context: A258957 A258950 A258949 * A205461 A374309 A345869

Adjacent sequences: A205947 A205948 A205949 * A205951 A205952 A205953

Keyword

nonn

Author

R. H. Hardin, Feb 02 2012

Status

approved