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Number of tree-rooted toroidal maps with 2 faces and n vertices and without isthmuses.
(Formerly M4743)
2

%I M4743 #9 Apr 04 2021 13:43:52

%S 10,192,1630,8924,36834,124560,362934,941820,2227368,4881448,889015725

%N Number of tree-rooted toroidal maps with 2 faces and n vertices and without isthmuses.

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

%H T. R. S. Walsh and A. B. Lehman, <a href="http://dx.doi.org/10.1016/0095-8956(75)90050-7">Counting rooted maps by genus. III: Nonseparable maps</a>, J. Combinatorial Theory Ser. B 18 (1975), 222-259.

%Y Cf. A006437.

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_

%E Name clarified by _Andrew Howroyd_, Apr 04 2021