A006403 Number of 2-connected planar maps with n edges. (Formerly M0808)

0, 1, 2, 3, 6, 15, 36, 114, 396, 1565, 6756, 31563, 154370, 785113, 4099948, 21870704, 118624544, 652485364, 3631820462, 20426666644, 115949791342, 663640383400

Offset

1,3

References

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

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

T. R. S. Walsh, personal communication.

Links

Table of n, a(n) for n=1..22.

T. R. S. Walsh, Number of sensed planar maps with n edges and m vertices

Crossrefs

Sequence in context: A053561 A237585 A147773 * A129960 A115098 A036418

Adjacent sequences: A006400 A006401 A006402 * A006404 A006405 A006406

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved