A052439 Number of simple unlabeled n-node graphs with 3 center nodes.

0, 0, 3, 0, 4, 18, 119, 1055, 17297, 486446, 24269709, 2095669951

Offset

1,3

Links

Table of n, a(n) for n=1..12.

Eric Weisstein's World of Mathematics, Graph Center

Crossrefs

Column 3 of A294525 for n > 3.

Cf. A052437, A052438, A052440, A052441.

Sequence in context: A180657 A094665 A309053 * A261239 A261214 A143073

Adjacent sequences: A052436 A052437 A052438 * A052440 A052441 A052442

Keyword

nonn,more

Author

Eric W. Weisstein

Extensions

a(8)-a(10) from Andrew Howroyd, Nov 02 2017

a(11)-a(12) from Sean A. Irvine, Nov 23 2021

Status

approved