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A006400 Number of connected planar maps without vertices of degree 1.
(Formerly M1404)
0

%I M1404 #16 Mar 30 2017 15:26:17

%S 1,1,2,5,11,33,117,431,1755,7485

%N Number of connected planar maps without vertices of degree 1.

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

%H Timothy R. Walsh, <a href="http://dx.doi.org/10.1137/0604018">Generating nonisomorphic maps without storing them</a>, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.

%K nonn,more

%O 3,3

%A _N. J. A. Sloane_

%E a(11) and a(12) from _Sean A. Irvine_, Mar 30 2017

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Last modified April 20 09:50 EDT 2024. Contains 371800 sequences. (Running on oeis4.)