login
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.
1
17920, 310912, 5550256, 101702648, 1912957100, 36783376600, 718097911212, 14168783055608, 281683319581364, 5628530205351848, 112878301213615480, 2269166138679395320, 45695383178079335324, 921207719717378895736
OFFSET
1,1
COMMENTS
Column 3 of A205954.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 02 2012
STATUS
approved