A006391 Number of unsensed planar maps with n edges and without loops. (Formerly M1464)

1, 2, 5, 14, 45, 191, 871, 4682, 27336, 172706, 1150322, 7989004

Offset

1,2

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=1..12.

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

Crossrefs

Sequence in context: A259871 A285201 A007823 * A240720 A232622 A149895

Adjacent sequences: A006388 A006389 A006390 * A006392 A006393 A006394

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

a(8)-a(12) from Sean A. Irvine, Mar 29 2017

Status

approved