A251211 Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having zero or two 1s

9, 63, 758, 16911, 666522, 48781920, 6424279907, 1559013699145, 686199785166132, 553366441376509592, 812147106821250119851, 2177986074523549871596544, 10645119952388702328957451736

Offset

1,1

Comments

Diagonal of A251219

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
..0..1..1..1..1....1..0..1..1..1....1..0..1..1..1....1..1..0..1..0
..1..1..1..1..1....1..1..1..1..0....1..1..1..1..0....1..1..1..1..1
..1..1..1..1..1....1..1..1..1..1....1..1..0..1..1....0..1..1..1..1
..0..1..1..1..1....0..1..1..1..1....0..1..1..1..0....1..1..1..1..1
..0..0..1..0..1....0..0..1..1..0....0..0..1..1..1....0..1..1..0..1

Crossrefs

Sequence in context: A065025 A165510 A165749 * A342197 A302975 A165447

Adjacent sequences: A251208 A251209 A251210 * A251212 A251213 A251214

Keyword

nonn

Author

R. H. Hardin, Nov 30 2014

Status

approved