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Search: id:A103938
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| A103938 |
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Number of rooted non-separable n-edge maps in the plane (planar with a distinguished outside face). |
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+0
2
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| 3, 2, 5, 18, 77, 364, 1836, 9690, 52877, 296010, 1690845, 9817080, 57769740, 343806368, 2065802056, 12515350122, 76367432013, 468922828150, 2895381678735, 17966214519330
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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V. A. Liskovets and T. R. Walsh, Enumeration of unrooted maps on the plane, Rapport technique, UQAM, No. 2005-01, Montreal, Canada, 2005.
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LINKS
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V. A. Liskovets and T. R. Walsh, Counting unrooted maps on the plane, Advances in Applied Math., 36, No.4 (2006), 364-387.
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FORMULA
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a(n)=(n+2)*A000139(n)/2.
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CROSSREFS
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Sequence in context: A111273 A068553 A077039 this_sequence A085973 A005265 A005266
Adjacent sequences: A103935 A103936 A103937 this_sequence A103939 A103940 A103941
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KEYWORD
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easy,nonn
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AUTHOR
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Valery A. Liskovets (liskov(AT)im.bas-net.by), Mar 17 2005
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