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A233802
Number of (1+2)X(n+2) 0..3 arrays with no increasing sequence of length 3 horizontally, vertically or antidiagonally downwards
1
169840, 7949773, 371832256, 17394286865, 812933550972, 37996849382405, 1775753454824996, 82989727430563759, 3878460708033509128, 181257189415291707470, 8470916031355361999378, 395881857242187296966873
OFFSET
1,1
COMMENTS
Row 1 of A233801
FORMULA
Empirical recurrence of order 60 (see link above)
EXAMPLE
Some solutions for n=1
..0..0..2....0..0..3....3..1..0....3..0..1....1..0..1....1..0..2....2..1..0
..2..0..0....1..0..3....1..3..1....0..3..1....3..2..3....1..1..2....1..3..0
..2..0..0....0..2..0....2..2..1....3..3..1....1..0..0....1..0..0....3..0..0
CROSSREFS
Sequence in context: A089203 A236054 A233801 * A233796 A288356 A233791
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 16 2013
STATUS
approved