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A141514 Number of n X n binary matrices, symmetric under 180 degree rotation, with no more than 3 ones in any 2 X 2 subblock. 1
1, 2, 3, 29, 176, 5621, 122557, 14694960, 1181467639, 516777127561, 152237306877120, 244601068560037129, 264412894413046723521, 1557984885076079288613088, 6177872087977594821120364739 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 0..20

CROSSREFS

Sequence in context: A144953 A132282 A064893 * A078727 A270550 A076977

Adjacent sequences:  A141511 A141512 A141513 * A141515 A141516 A141517

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 10 2008

STATUS

approved

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Last modified May 31 10:42 EDT 2020. Contains 334748 sequences. (Running on oeis4.)