A006397 Number of unsensed planar maps with n edges and without faces or vertices of degree 1. (Formerly M1236)

1, 2, 4, 10, 34, 114, 475, 2104, 10177, 52012, 279874

Offset

2,2

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=2..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: A323207 A327424 A220028 * A297197 A297201 A003422

Adjacent sequences: A006394 A006395 A006396 * A006398 A006399 A006400

Keyword

nonn

Author

N. J. A. Sloane

Extensions

a(9)-a(12) from Sean A. Irvine, Mar 28 2017

Status

approved