A324061 Number of simple connected graphs on n unlabeled nodes with radius 2.

0, 0, 0, 2, 10, 76, 682, 9864, 245518, 11366961

Offset

1,4

Links

Table of n, a(n) for n=1..10.

Eric Weisstein's World of Mathematics, Graph Radius.

Wikipedia, Distance (graph theory).

Crossrefs

Column k=2 of A324239.

Sequence in context: A321394 A320956 A355349 * A307524 A066223 A355110

Adjacent sequences: A324058 A324059 A324060 * A324062 A324063 A324064

Keyword

nonn,more

Author

Andrew Howroyd, Sep 03 2019

Status

approved