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A234069
Number of (1+2)X(n+2) 0..3 arrays with no increasing sequence of length 3 horizontally or diagonally downwards
1
205808, 10268904, 502595832, 24576912260, 1199897571228, 58576345841356, 2859193780644876, 139560139052400248, 6811998968783551560, 332496786974014167368, 16229306364406839778800, 792159143550043088739188
OFFSET
1,1
COMMENTS
Row 1 of A234068
FORMULA
Empirical recurrence of order 54 (see link above)
EXAMPLE
Some solutions for n=1
..1..3..2....1..1..1....1..0..3....0..3..0....1..0..2....0..0..1....1..3..2
..0..3..1....3..3..0....0..2..2....3..3..2....2..0..0....1..1..0....3..0..2
..3..3..0....3..2..1....1..0..2....2..0..1....2..0..2....0..3..0....3..2..3
CROSSREFS
Sequence in context: A177006 A236033 A234068 * A234061 A234060 A115946
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2013
STATUS
approved