A206093 Number of (n+1) X 8 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

205416, 165936, 240192, 1645920, 8613504, 56633472, 408445632, 2199502080, 14566314240, 105251128704, 567471536640, 3758109073920, 27154791205632, 146407656453120, 969592141071360, 7005936131053056, 37773175364904960

Offset

1,1

Comments

Column 7 of A206094.

Links

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

Formula

Empirical: a(n) = 258*a(n-3) for n>10.

Example

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

Crossrefs

Cf. A206094.

Sequence in context: A237014 A218448 A234836 * A333015 A177006 A236033

Adjacent sequences: A206090 A206091 A206092 * A206094 A206095 A206096

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved