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A006402
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Nonseparable planar maps with n edges.
(Formerly M0812)
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1
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1, 2, 3, 6, 16, 42, 151, 596, 2605, 12098, 59166, 297684, 1538590, 8109078, 43476751, 236474942, 1302680941, 7256842362, 40832979283, 231838418310, 1327095781740
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,2
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REFERENCES
| Liskovets, V. A.; Walsh, T. R. S.; The enumeration of nonisomorphic $2$-connected planar maps. Canad. J. Math. 35 (1983), no. 3, 417-435.
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.
T. R. S. Walsh, personal communication.
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CROSSREFS
| Sequence in context: A159341 A159342 A089872 * A145860 A087983 A103593
Adjacent sequences: A006399 A006400 A006401 * A006403 A006404 A006405
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Some people begin this 2,1,2,3,6,..., others begin it 0,1,2,3,6,....
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