A206205 Number of (n+1)X8 0..3 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases

468968, 192808, 145208, 337896, 713408, 1080648, 3270240, 7008160, 10936160, 33660800, 72736960, 113216800, 339966080, 729156480, 1132733728, 3399739520, 7291568000, 11327337280, 33997395200, 72915680000, 113273372800

Offset

1,1

Comments

Column 7 of A206206

Links

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

Formula

Empirical: a(n) = 10*a(n-3) for n>17

Example

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

Crossrefs

Sequence in context: A238045 A341152 A096889 * A227767 A328255 A092010

Adjacent sequences: A206202 A206203 A206204 * A206206 A206207 A206208

Keyword

nonn

Author

R. H. Hardin Feb 04 2012

Status

approved