A140314 Number of n X n binary matrices containing no more than two 1's in any 2 X 2 sub-block.

1, 2, 11, 195, 8969, 1232795, 471487297, 516844071813, 1603508113421239, 14148460147460008963, 354360105981877906958557, 25210728065407321182797745205, 5093486498660018140333056634922039

Offset

0,2

Comments

No more than 1 1 in any 2 X 2 sub-block gives A063443.

No more than 3 1's in any 2 X 2 sub-block gives A139810.

Links

R. H. Hardin, May 25 2008, Table of n, a(n) for n = 0..15

Crossrefs

Cf. A063443, A139810.

Sequence in context: A013104 A007984 A132871 * A226052 A271429 A051663

Adjacent sequences: A140311 A140312 A140313 * A140315 A140316 A140317

Keyword

nonn

Author

R. H. Hardin, May 25 2008

Status

approved