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 A184378 1/12 the number of (n+2)X3 0..2 arrays with each 3X3 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A184386 LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 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 4X3 ..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 Sequence in context: A350210 A250801 A184386 * A180294 A330446 A317984 Adjacent sequences:  A184375 A184376 A184377 * A184379 A184380 A184381 KEYWORD nonn AUTHOR R. H. Hardin Jan 12 2011 STATUS approved

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Last modified January 20 13:55 EST 2022. Contains 350472 sequences. (Running on oeis4.)