A123485 Number of n-node labeled trivalent (or cubic) graphs with connectivity 2.

0, 0, 0, 2520, 1814400, 1888563600, 2979953776800, 6935468956416000, 23019567930463104000, 105689740661883810432000, 653795414851090462030080000, 5326203537908913517889391360000

Offset

1,4

References

R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1977.

Links

R. W. Robinson, Table of n, a(n) for n = 1..30

Crossrefs

Sequence in context: A109480 A066599 A107531 * A282433 A228080 A172553

Adjacent sequences: A123482 A123483 A123484 * A123486 A123487 A123488

Keyword

nonn

Author

N. J. A. Sloane, Nov 13 2006

Status

approved