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A184378
1/12 the number of (n+2) X 3 0..2 arrays with each 3 X 3 subblock containing three of each value.
1
140, 545, 2174, 9113, 43295, 212747, 1096781, 6045233, 33958643, 194694395, 1141026791, 6726497945, 39885267065, 237890735825, 1421015749799, 8500910306963, 50929911923495, 305241246279617, 1830098075374121
OFFSET
1,1
COMMENTS
Column 1 of A184386.
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1)-27*a(n-2)+81*a(n-3)-630*a(n-4)+1701*a(n-5)-1620*a(n-6)+4860*a(n-7)-13122*a(n-8)+8748*a(n-9).
EXAMPLE
Some solutions with a(1,1)=0 for 4 X 3
..0..2..2....0..2..0....0..2..2....0..2..1....0..2..1....0..0..0....0..0..2
..1..1..2....2..1..1....0..1..1....0..1..2....1..0..0....2..2..2....1..2..2
..1..0..0....0..2..1....0..2..1....0..2..1....1..2..2....1..1..1....0..1..1
..2..2..0....0..2..0....2..2..0....2..0..1....2..0..1....0..0..0....2..0..0
CROSSREFS
Cf. A184386.
Sequence in context: A350210 A250801 A184386 * A180294 A330446 A317984
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2011
STATUS
approved