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A234061
Number of (n+2)X(1+2) 0..3 arrays with no increasing sequence of length 3 horizontally or diagonally downwards
1
205808, 11758836, 671548560, 38351813588, 2190245258368, 125083358211012, 7143421916769712, 407955761112088052, 23298064277080047968, 1330535932548632543396, 75985963758367046917776
OFFSET
1,1
COMMENTS
Column 1 of A234068
LINKS
FORMULA
Empirical: a(n) = 60*a(n-1) -139*a(n-2) -1552*a(n-3) +3544*a(n-4) +640*a(n-5) -4720*a(n-6) +2048*a(n-7)
EXAMPLE
Some solutions for n=1
..1..3..2....0..0..0....0..1..0....0..0..2....1..1..0....0..3..1....2..0..1
..2..1..2....0..3..3....2..3..1....0..0..2....1..2..2....0..0..2....3..1..3
..3..3..1....0..2..1....3..3..3....2..1..0....0..3..2....1..1..0....1..0..2
CROSSREFS
Sequence in context: A236033 A234068 A234069 * A234060 A115946 A082176
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2013
STATUS
approved