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A141509 Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 3 ones in any 2 X 2 subblock. 1
1, 2, 3, 57, 128, 22077, 65205, 114142368, 468343535, 7969215344753, 44467930404864, 7479088292930771309, 57134805472751200753, 94492733598842569249024512, 986251920362343910672065291 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 0..31

CROSSREFS

Sequence in context: A179281 A000656 A116052 * A054313 A080052 A157190

Adjacent sequences:  A141506 A141507 A141508 * A141510 A141511 A141512

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 10 2008

STATUS

approved

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Last modified May 27 05:48 EDT 2020. Contains 334649 sequences. (Running on oeis4.)