A006405 Number of unsensed 2-connected maps without faces of degree 2. (Formerly M1365)

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

Offset

3,3

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.

Links

Table of n, a(n) for n=3..12.

Crossrefs

Sequence in context: A294633 A320798 A364267 * A305189 A344394 A243559

Adjacent sequences: A006402 A006403 A006404 * A006406 A006407 A006408

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

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

Status

approved