A058893 - OEIS

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A058893

Triangle arising in enumeration of maps on projective plane.

1

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; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

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.

EXAMPLE

Triangle starts:

1;

5,9;

22,112,118;

93,899,2346,1773;

...

CROSSREFS

A000346 is first column.

Sequence in context: A299266 A219521 A215178 * A263830 A343803 A194802

Adjacent sequences: A058890 A058891 A058892 * A058894 A058895 A058896

KEYWORD

nonn,tabl,more

AUTHOR

N. J. A. Sloane, Jan 08 2001

STATUS

approved