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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.
1
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
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: A373737 A085446 A274027 * A044985 A302283 A186844
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 04 2012
STATUS
approved