A251318 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having one or two 1s

10, 116, 2804, 157312, 18415674, 4911447738, 2766068478692, 3496332976040148, 9445243384724999530, 56648036031686971128288, 732454090774743685368594486, 20877132584603122578819078333432, 1289954839986383433021857780921092718

Offset

1,1

Comments

Diagonal of A251326

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

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

Crossrefs

Sequence in context: A233908 A089833 A308667 * A083448 A024129 A262970

Adjacent sequences: A251315 A251316 A251317 * A251319 A251320 A251321

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved