A233620 Number of (2+2)X(n+2) 0..2 arrays with no increasing sequence of length 3 horizontally or diagonally downwards

430608, 27826929, 1777375908, 113340508656, 7222554443566, 460194589763836, 29320690351065445, 1868112829445921314, 119023011702892254856, 7583305026602442683556, 483154524353295641124009

Offset

1,1

Comments

Row 2 of A233618

Links

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

R. H. Hardin, Empirical recurrence of order 68

Formula

Empirical recurrence of order 68 (see link above)

Example

Some solutions for n=1
..0..0..0....0..2..0....0..2..0....0..2..0....0..2..1....0..0..1....0..0..1
..2..0..0....1..0..0....2..0..0....2..2..2....0..2..1....1..2..0....0..2..1
..0..2..2....0..2..1....1..0..2....2..1..0....2..0..0....1..1..1....1..1..1
..1..0..0....1..2..1....0..2..1....1..1..2....2..2..0....0..0..2....2..1..0

Crossrefs

Sequence in context: A234857 A186593 A328197 * A271110 A237926 A117318

Adjacent sequences: A233617 A233618 A233619 * A233621 A233622 A233623

Keyword

nonn

Author

R. H. Hardin, Dec 14 2013

Status

approved