Number of nonseparable rooted toroidal maps with n + 3 edges and n + 1 vertices.

Terms

a(0) =4a(1) =39a(2) =190a(3) =651a(4) =1792a(5) =4242a(6) =8988a(7) =17490a(8) =31812a(9) =54769a(10) =90090a(11) =142597a(12) =218400a(13) =325108a(14) =472056a(15) =670548a(16) =934116a(17) =1278795a(18) =1723414a(19) =2289903a(20) =3003616a(21) =3893670a(22) =4993300a(23) =6340230a(24) =7977060a(25) =9951669a(26) =12317634a(27) =15134665a(28) =18469056a(29) =22394152