A052440 Number of simple unlabeled n-node graphs with 4 center nodes.

0, 0, 0, 7, 0, 18, 118, 1426, 24853, 763319, 39773455, 3569963990

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn
• more

Links

• Eric Weisstein's World of Mathematics, Graph Center

Crossrefs

Column 4 of A294525 for n > 4.

Cf. A052437, A052438, A052439, A052441.

Extensions

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

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