A052438 Number of simple unlabeled n-node graphs with 2 center nodes.

0, 2, 0, 2, 4, 19, 84, 821, 12485, 343572, 16164685, 1289300669

Offset

1,2

Links

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

Eric Weisstein's World of Mathematics, Graph Center

Crossrefs

Column 2 of A294525 for n > 2.

Cf. A052437, A052439, A052440, A052441.

Sequence in context: A226430 A067648 A279327 * A324045 A358405 A209701

Adjacent sequences: A052435 A052436 A052437 * A052439 A052440 A052441

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