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A137861
Number of unlabeled graphs with n nodes and an odd sum of nodes and edges.
0
1, 1, 2, 5, 18, 78, 522, 6168, 137352, 6002584, 509498932, 82545585936, 25251015686776, 14527077828617744, 15713242984902154384, 32000507852263778595584, 122967932076766466347469888
OFFSET
1,3
COMMENTS
a(n) = A054960(n) for even n and A007869(n) for odd n.
CROSSREFS
Cf. A054960 Number of unlabeled graphs with n nodes and an odd number of edges. A007869 Complementary pairs of graphs on n nodes. Also unlabeled graphs with n nodes and an even number of edges.
Sequence in context: A208968 A338179 A206293 * A286282 A192637 A111916
KEYWORD
nonn
AUTHOR
Tanya Khovanova, Apr 29 2008
STATUS
approved