A006405 - OEIS

A006405

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

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

(list; graph; refs; listen; history; text; internal format)

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

CROSSREFS

KEYWORD

nonn

AUTHOR

EXTENSIONS

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

STATUS

approved