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A205747
Number of (n+1)X3 0..2 arrays with every 2X2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..2 introduced in row major order
1
48, 284, 1936, 12384, 82992, 542718, 3602578, 23691830, 156738676, 1033041690, 6824741078, 45020426618, 297261797768, 1961609742846, 12949334504402, 85463493135422, 564128280317020, 3723357621326818, 24576331604189646
OFFSET
1,1
COMMENTS
Column 2 of A205753
LINKS
FORMULA
Empirical: a(n) = 33*a(n-2) +76*a(n-3) +13*a(n-4) -284*a(n-5) -597*a(n-6) +484*a(n-7) +1376*a(n-8) +36*a(n-9) -752*a(n-10) -256*a(n-11) for n>12
EXAMPLE
Some solutions for n=4
..0..1..2....0..0..0....0..0..1....0..1..0....0..0..0....0..0..0....0..0..1
..0..1..2....0..1..0....2..0..1....0..0..0....0..0..0....1..2..1....0..1..1
..1..2..1....1..2..1....0..1..0....1..2..1....0..1..0....1..1..1....2..2..0
..2..2..1....2..2..1....1..1..0....0..1..2....1..2..1....1..1..1....1..2..0
..1..0..0....1..0..0....0..2..2....0..1..1....2..2..1....1..2..1....2..1..2
CROSSREFS
Sequence in context: A115056 A001337 A259993 * A173121 A281234 A215262
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 30 2012
STATUS
approved