A187237 Number of simple connected imperfect graphs on n vertices.

0, 0, 0, 0, 1, 7, 129, 3312, 134303, 8594350, 894307856, 158323596832

Offset: 1

Author

Eric W. Weisstein, Mar 07 2011

Keywords

• nonn
• more
• hard

Links

• Eric Weisstein's World of Mathematics, Imperfect Graph.

Crossrefs

Cf. A001349, A052433, A187236.

Formula

a(n) = A001349(n) - A052433(n).

Extensions

a(12) using formula by Falk Hüffner, Jan 15 2016