A324670 Number of simple graphs on n unlabeled nodes with minimum degree exactly 2.

0, 0, 1, 2, 8, 43, 360, 4869, 113622, 4605833, 325817259, 40350371693, 8825083057727, 3447229161054412, 2432897732375453872, 3135299553791882831175, 7445569254636418368355175, 32831169277561326131677454356, 270499962116368309216399255404116

Offset

1,4

Links

Table of n, a(n) for n=1..19.

Eric Weisstein's World of Mathematics, Minimum Vertex Degree

Formula

a(n) = A261919(n) - A007111(n).

Crossrefs

Column k=2 of A294217.

A diagonal of A263293.

Cf. A005637, A007111, A261919.

Sequence in context: A106327 A009309 A276497 * A334335 A283416 A075817

Adjacent sequences: A324667 A324668 A324669 * A324671 A324672 A324673

Keyword

nonn

Author

Andrew Howroyd, Sep 03 2019

Status

approved