A006394 Number of sensed planar maps with n edges and without loops or parallel edges.

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

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• more

Comments

The planar maps considered here are connected. A planar map without loops or parallel edges is called simple. - Andrew Howroyd, Jan 16 2025

References

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

Links

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

Crossrefs

Cf. A006384, A006390, A006395 (unsensed), A022558 (rooted).

Extensions

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

a(0)=1 prepended by Andrew Howroyd, Jan 16 2025