A214806 Triangle read by rows: T(n,k) = number of rooted maps with n vertices and k faces on a non-orientable surface of type 2 (0 <= k <= n).

0, 0, 488, 0, 11660, 375552, 0, 160680, 6652366, 146387872, 0, 1678880, 86303920, 2298445830, 42795288180, 0, 14771680, 918342738, 28995928200, 629732269188, 10663498973088

Offset: 0

Author

N. J. A. Sloane, Jul 28 2012

Keywords

• nonn
• tabl

Examples

			Triangle begins:
  0,
  0,488,
  0,11660,375552,
  0,160680,6652366,146387872,
  0,1678880,86303920,2298445830,42795288180,
  0,14771680,918342738,28995928200,629732269188,10663498973088,
  ...
		

Links

• Didier Arquès and Alain Giorgetti, Counting rooted maps on a surface, Theoret. Comput. Sci. 234 (2000), no. 1-2, 255--272. MR1745078 (2001f:05078).

Crossrefs

Diagonals give A118449, A214804, A214805, A214807. Cf. A214337.