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A141504 Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 2 ones in any 2 X 2 subblock. 1
1, 2, 1, 11, 7, 195, 85, 8969, 3573, 1232795, 391285, 471487297, 125714303, 516844071813, 113185189874, 1603508113421239, 290842806833709, 14148460147460008963, 2118392163856080466, 354360105981877906958557 (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: A143888 A016546 A303611 * A141482 A262144 A079795

Adjacent sequences:  A141501 A141502 A141503 * A141505 A141506 A141507

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 10 2008

STATUS

approved

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Last modified May 28 04:00 EDT 2020. Contains 334671 sequences. (Running on oeis4.)