A206210 Number of (n+1) X 4 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly two equal edges, and new values 0..2 introduced in row major order.

162, 336, 760, 2224, 5632, 14416, 40032, 101376, 259488, 720576, 1824768, 4670784, 12970368, 32845824, 84074112, 233466624, 591224832, 1513334016, 4202399232, 10642046976, 27240012288, 75643186176, 191556845568, 490320221184

Offset

1,1

Comments

Column 3 of A206215.

Links

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

Formula

Empirical: a(n) = 18*a(n-3) for n>6.

Example

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

Crossrefs

Cf. A206215.

Sequence in context: A045010 A085446 A274027 * A044985 A302283 A186844

Adjacent sequences: A206207 A206208 A206209 * A206211 A206212 A206213

Keyword

nonn

Author

R. H. Hardin, Feb 04 2012

Status

approved