Number of nonseparable rooted toroidal maps with n + 4 edges and n + 1 vertices.

Terms

a(0) =10a(1) =190a(2) =1568a(3) =8344a(4) =33580a(5) =111100a(6) =317680a(7) =811096a(8) =1891318a(9) =4094090a(10) =8328320a(11) =16071120a(12) =29636984a(13) =52540472a(14) =89974880a(15) =149432720a(16) =241497410a(17) =380839382a(18) =587453856a(19) =888181800a(20) =1318560100a(21) =1925051700a(22) =2767711440a(23) =3923348520a(24) =5489251950a(25) =7587551010a(26) =10370288640