A058893 Triangle arising in enumeration of maps on projective plane.

1, 5, 9, 22, 112, 118, 93, 899, 2346, 1773, 386, 5940, 27446, 48426, 28650, 1586, 35138, 247752, 745180, 995290, 484578

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