A233489 Number of (n+2)X(n+2) 0..2 arrays with no increasing sequence of length 3 horizontally or antidiagonally downwards

16928, 26851581, 325881917874, 30258000792128359, 21465796875243969838158, 116334766873906705110905737848, 4816818414167397900878136977065117439, 1523736584959855755536079832732491749466846054

Offset

1,1

Comments

Diagonal of A233497

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Sequence in context: A233497 A233498 A233490 * A205606 A205437 A235978

Adjacent sequences: A233486 A233487 A233488 * A233490 A233491 A233492

Keyword

nonn

Author

R. H. Hardin, Dec 11 2013

Status

approved