A006394 Number of connected planar maps with n nodes and without loops or parallel edges. (Formerly M2498)

1, 1, 3, 5, 15, 52, 213, 1002, 5167, 27967, 158447, 926786

Offset

1,3

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

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

Timothy R. Walsh, Generating nonisomorphic maps without storing them, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.

Crossrefs

Sequence in context: A018601 A190733 A211344 * A018650 A177814 A018702

Adjacent sequences: A006391 A006392 A006393 * A006395 A006396 A006397

Keyword

nonn,more

Author

N. J. A. Sloane

Extensions

a(9)-a(12) from Sean A. Irvine, Mar 30 2017

Status

approved