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A251318 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having one or two 1s 1
10, 116, 2804, 157312, 18415674, 4911447738, 2766068478692, 3496332976040148, 9445243384724999530, 56648036031686971128288, 732454090774743685368594486, 20877132584603122578819078333432, 1289954839986383433021857780921092718 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 16 04:59 EST 2022. Contains 350374 sequences. (Running on oeis4.)