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A204416
Number of (n+2)X9 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically, exactly one way
1
2004465237, 2826265830, 3619976949, 6016853259, 8802512928, 13168291392, 27153833472, 206114865408, 2587131767808, 13862829908736, 122134679546112, 1514872207710720, 8036997091598592, 70505197603909632, 874092505119473664
OFFSET
1,1
COMMENTS
Column 7 of A204417
LINKS
FORMULA
Empirical: a(n) = 577*a(n-3) for n>18
EXAMPLE
Some solutions for n=3
..1..2..1..1..0..2..2..0..2....0..1..0..1..1..0..1..1..0
..0..1..2..0..1..0..1..1..0....0..1..1..0..2..1..0..2..1
..2..0..1..2..2..1..0..2..1....0..0..2..1..0..2..1..0..2
..2..2..0..1..2..2..1..0..2....0..1..2..2..1..2..2..1..0
..0..1..2..0..1..2..2..1..0....1..0..1..2..2..1..0..2..2
CROSSREFS
Sequence in context: A232129 A251506 A259349 * A335839 A195225 A172706
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2012
STATUS
approved