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A204604
Number of (n+2)X7 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally, vertically or nw-to-se diagonally exactly one way
1
16247580, 40672735, 43980907, 69792825, 207096000, 1139760144, 6656676736, 61015724528, 513802492708, 3004591151584, 27074363705888, 227330083011172, 1328325507137504, 11969420064914272, 100501902404767796
OFFSET
1,1
COMMENTS
Column 5 of A204607
LINKS
FORMULA
Empirical: a(n) = 442*a(n-3) +43*a(n-6) for n>16
EXAMPLE
Some solutions for n=3
..2..0..2..0..0..0..2....2..1..0..2..1..0..1....2..2..2..0..2..1..0
..0..2..2..1..0..1..0....1..2..1..0..1..1..0....1..2..2..1..0..2..1
..0..1..2..2..1..0..2....0..2..2..1..0..2..1....0..1..2..2..1..0..2
..1..0..1..2..2..1..2....0..1..2..2..1..1..2....1..0..1..2..2..1..2
..0..2..0..1..2..2..2....0..0..1..2..2..0..1....0..0..0..1..2..2..1
CROSSREFS
Sequence in context: A179585 A105650 A234457 * A253716 A216004 A155949
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 17 2012
STATUS
approved