A006398 Number of sensed planar maps with n edges and without loops or isthmuses. (Formerly M1163)

1, 0, 1, 2, 4, 8, 29, 92, 403, 1846, 9239, 48028, 259567

Offset

0,4

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=0..12.

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

Crossrefs

Cf. A006384, A006390, A006399 (unsensed), A099553 (rooted).

Sequence in context: A269569 A366080 A018346 * A053364 A326330 A018355

Adjacent sequences: A006395 A006396 A006397 * A006399 A006400 A006401

Keyword

nonn,more

Author

N. J. A. Sloane

Extensions

a(9)-a(12) from Sean A. Irvine, Mar 29 2017

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

Status

approved