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A086879
Number of symmetric singular n X n matrices over GF(2).
1
1, 4, 36, 576, 18880, 1208320, 155553792, 39821770752, 20417644331008, 20907667794952192, 42834024773286100992, 175448165471379869663232, 1437398154830976169705209856, 23550331368750713564450158280704
OFFSET
1,2
FORMULA
a(n) = 2^(n*(n+1)/2) - A086812(n).
CROSSREFS
Cf. A086812.
Sequence in context: A306736 A307845 A346292 * A372241 A363010 A263445
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 16 2003
EXTENSIONS
More terms from Ray Chandler, Sep 19 2003
STATUS
approved