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

Author

Andrew Howroyd, Apr 04 2021

Keywords

• nonn

Links

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

Crossrefs

Row sums of A343090.

Cf. A343093.