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A238317
Number of (n+1)X(2+1) 0..2 arrays with no element greater than all horizontal neighbors or less than all vertical neighbors
1
9, 67, 376, 1867, 9489, 50232, 267174, 1408341, 7395987, 38886701, 204722786, 1077853232, 5673085286, 29856142160, 157133586571, 827031030519, 4352855509300, 22909846720541, 120578232671314, 634623931681625
OFFSET
1,1
COMMENTS
Column 2 of A238323
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) -12*a(n-2) +39*a(n-3) +6*a(n-4) +62*a(n-5) +49*a(n-6) +33*a(n-7) -32*a(n-8) -41*a(n-9) -12*a(n-10) +6*a(n-11) +5*a(n-12) +a(n-13)
EXAMPLE
Some solutions for n=5
..2..2..1....1..1..1....0..1..1....1..1..1....2..2..2....1..2..2....0..2..2
..1..1..1....1..1..1....0..0..0....0..0..0....0..0..0....0..0..0....0..2..2
..1..1..1....2..2..0....0..0..0....0..0..0....0..0..0....0..0..0....2..2..1
..1..1..0....1..1..0....0..2..2....2..2..0....0..0..0....0..1..1....0..0..0
..1..1..0....0..1..1....0..2..2....2..2..2....0..1..1....1..2..2....0..0..0
..1..2..2....0..2..2....0..2..2....2..2..2....1..1..1....2..2..2....2..2..1
CROSSREFS
Sequence in context: A332456 A255877 A197277 * A105287 A163349 A016130
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2014
STATUS
approved