Number of rooted toroidal maps with 3 faces and n vertices and without separating cycles or isthmuses.

A006423

Number of rooted toroidal maps with 3 faces and n vertices and without separating cycles or isthmuses.

Terms

    a(0) =10a(1) =240a(2) =2246a(3) =12656a(4) =52164a(5) =173776a(6) =495820a(7) =1256992a(8) =2902702a(9) =6214208a(10) =12494482a(11) =23827440a(12) =43430088a(13) =76120288a(14) =128926232a(15) =211867328a(16) =338940050a(17) =529346384a(18) =809006814a(19) =1212404336a(20) =1784810764a(21) =2584951600a(22) =3688170980a(23) =5190163680a(24) =7211346870a(25) =9901950240a(26) =13447909290

External references