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A233612 Number of (n+2)X(2+2) 0..2 arrays with no increasing sequence of length 3 horizontally or diagonally downwards 1
395955, 27826929, 1955165211, 137370562281, 9651696380883, 678130944334209, 47645673900633963, 3347598657948373881, 235203237936279213219, 16525446682220210003409, 1161082604317640744905083 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A233618

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 75*a(n-1) -279*a(n-2) -4023*a(n-3) +15264*a(n-4) +56196*a(n-5) -228096*a(n-6) +186624*a(n-7)

EXAMPLE

Some solutions for n=1

..0..0..1..1....0..0..1..1....0..2..1..2....0..2..0..1....0..1..1..2

..0..0..1..0....2..0..2..2....2..1..2..2....2..0..2..1....2..1..0..1

..2..0..1..0....0..0..1..0....0..1..0..1....2..2..1..0....2..1..1..1

CROSSREFS

Sequence in context: A230792 A131277 A250453 * A234909 A224633 A050434

Adjacent sequences:  A233609 A233610 A233611 * A233613 A233614 A233615

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2013

STATUS

approved

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Last modified December 5 03:03 EST 2021. Contains 349530 sequences. (Running on oeis4.)