A343091 Number of rooted toroidal maps with n edges and no separating cycles or isthmuses.

1, 8, 67, 520, 3978, 29988, 224295, 1667888, 12352126, 91196512, 671717950, 4938370736, 36251576684, 265787720908, 1946696834735, 14245828801024, 104173927718694, 761302443498960, 5560564162774202, 40595140188994224, 296242813675800300, 2161031983823779912

Offset

2,2

Links

Andrew Howroyd, Table of n, a(n) for n = 2..100

Crossrefs

Row sums of A343090.

Cf. A343093.

Sequence in context: A166815 A166797 A196453 * A037594 A037685 A228419

Adjacent sequences: A343088 A343089 A343090 * A343092 A343093 A343094

Keyword

nonn

Author

Andrew Howroyd, Apr 04 2021

Status

approved