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A058893
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Triangle arising in enumeration of maps on projective plane.
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1
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1, 5, 9, 22, 112, 118, 93, 899, 2346, 1773, 386, 5940, 27446, 48426, 28650, 1586, 35138, 247752, 745180, 995290, 484578
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| E. A. Bender, E. R. Canfield and R. W. Robinson, The enumeration of maps on the torus and the projective plane, Canad. Math. Bull., 31 (1988), 257-271; see p. 270.
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EXAMPLE
| 1; 5,9; 22,112,118; 93,899,2346,1773; ...
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CROSSREFS
| A000346 is first column.
Sequence in context: A110200 A063404 A102177 * A194802 A074340 A079993
Adjacent sequences: A058890 A058891 A058892 * A058894 A058895 A058896
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KEYWORD
| nonn,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 08 2001
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