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A187237
Number of simple connected imperfect graphs on n vertices.
1
0, 0, 0, 0, 1, 7, 129, 3312, 134303, 8594350, 894307856, 158323596832
OFFSET
1,6
LINKS
Eric Weisstein's World of Mathematics, Imperfect Graph.
FORMULA
a(n) = A001349(n) - A052433(n).
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Eric W. Weisstein, Mar 07 2011
EXTENSIONS
a(12) using formula by Falk Hüffner, Jan 15 2016
STATUS
approved