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

1,4

Links

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

Eric Weisstein's World of Mathematics, Graph Center

Crossrefs

Column 4 of A294525 for n > 4.

Cf. A052437, A052438, A052439, A052441.

Sequence in context: A245543 A225949 A067152 * A246919 A167299 A340952

Adjacent sequences: A052437 A052438 A052439 * A052441 A052442 A052443

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