Number of nonseparable toroidal tree-rooted maps with n + 2 edges and n + 1 vertices.

Terms

a(0) =1a(1) =9a(2) =40a(3) =125a(4) =315a(5) =686a(6) =1344a(7) =2430a(8) =4125a(9) =6655a(10) =10296a(11) =15379a(12) =22295a(13) =31500a(14) =43520a(15) =58956a(16) =78489a(17) =102885a(18) =133000a(19) =169785a(20) =214291a(21) =267674a(22) =331200a(23) =406250a(24) =494325a(25) =597051a(26) =716184a(27) =853615a(28) =1011375a(29) =1191640