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 A204639 Number of (n+2)X7 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order 1
 16855, 1860, 760, 1169, 3300, 3077, 9482, 35500, 109224, 410467, 1557742, 5832593, 22104912, 83813366, 317543288, 1203875773, 4564263072, 17303784013, 65603558830, 248722043144, 942974900136, 3575089065983, 13554191912090 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A204642 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 5*a(n-1) -3*a(n-2) -4*a(n-3) -12*a(n-4) +12*a(n-5) +21*a(n-6) -9*a(n-7) -9*a(n-8) for n>10 EXAMPLE Some solutions for n=3 ..0..0..0..0..0..0..0....0..0..1..0..1..2..0....0..1..2..2..2..0..0 ..0..0..0..0..0..0..0....0..0..1..0..1..2..0....0..2..2..2..0..0..0 ..1..1..1..1..1..1..1....0..0..1..0..1..2..0....2..2..2..0..0..0..3 ..2..2..2..2..2..2..2....0..0..1..0..1..2..0....2..2..0..0..0..3..3 ..1..1..1..1..1..1..1....0..0..1..0..1..2..0....2..0..0..0..3..3..3 CROSSREFS Sequence in context: A061364 A203891 A088164 * A170797 A200973 A190935 Adjacent sequences:  A204636 A204637 A204638 * A204640 A204641 A204642 KEYWORD nonn AUTHOR R. H. Hardin Jan 17 2012 STATUS approved

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