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A141048
Number of n X n binary matrices, symmetric under 180 degree rotation, with rows, considered as binary numbers, in nondecreasing order.
0
1, 2, 3, 6, 19, 104, 714, 10288, 181480, 8058336, 431947824, 66774883640, 11792570643048, 6617203485824240, 3981347426807559400, 8141786556740296629920, 17017992772547895875527944
OFFSET
0,2
CROSSREFS
Sequence in context: A182250 A121959 A075633 * A326030 A124066 A319204
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 31 2008
STATUS
approved