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A141510 Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 3 ones in any 2 X 2 subblock. 1
1, 2, 1, 15, 8, 417, 135, 42176, 10425, 15701273, 2699264, 21418970801, 2653515137, 107224417436160, 9445766123241, 1968910887183791359, 123951426556200960, 132633131268024896655873, 5955955433730968860975 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 0..30

CROSSREFS

Sequence in context: A290603 A083074 A181869 * A219899 A326600 A272304

Adjacent sequences:  A141507 A141508 A141509 * A141511 A141512 A141513

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 10 2008

STATUS

approved

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Last modified May 30 15:38 EDT 2020. Contains 334726 sequences. (Running on oeis4.)