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A140314 Number of n X n binary matrices containing no more than two 1's in any 2 X 2 sub-block. 2
1, 2, 11, 195, 8969, 1232795, 471487297, 516844071813, 1603508113421239, 14148460147460008963, 354360105981877906958557, 25210728065407321182797745205, 5093486498660018140333056634922039 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 1 09:53 EDT 2020. Contains 334762 sequences. (Running on oeis4.)