A006395 Number of unsensed connected planar maps with n nodes and without loops or parallel edges. (Formerly M2494)

1, 1, 3, 5, 14, 42, 150, 624, 2947, 15079, 82607, 474030

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: A318227 A363542 A230585 * A078718 A081393 A338368

Adjacent sequences: A006392 A006393 A006394 * A006396 A006397 A006398

Keyword

nonn,more

Author

N. J. A. Sloane

Extensions

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

Status

approved