A006405 Number of unsensed 2-connected maps with n edges and without faces of degree 2.

1, 1, 2, 5, 9, 24, 70, 222, 785, 3055

Offset: 3

Author

N. J. A. Sloane

Keywords

• nonn
• more

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. A006385, A006403, A006405 (sensed).

Extensions

a(11) and a(12) from Sean A. Irvine, Apr 02 2017