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A204623
Number of (n+1)X2 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order
4
12, 96, 768, 6144, 49152, 393216, 3145728, 25165824, 201326592, 1610612736, 12884901888, 103079215104, 824633720832, 6597069766656, 52776558133248, 422212465065984, 3377699720527872, 27021597764222976, 216172782113783808
OFFSET
1,1
COMMENTS
Column 1 of A204630
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1)
EXAMPLE
Some solutions for n=3
..0..0....0..0....0..0....0..0....0..1....0..0....0..0....0..0....0..0....0..1
..0..1....1..2....0..1....0..1....2..1....1..1....0..1....0..1....0..1....1..1
..2..2....0..2....0..1....1..2....2..0....2..0....1..1....0..0....2..1....1..2
..0..2....2..1....0..1....2..2....0..1....0..1....1..2....2..1....0..2....1..2
CROSSREFS
Sequence in context: A264418 A073392 A038845 * A270568 A223151 A155620
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 17 2012
STATUS
approved