Genus of complete graph on n nodes.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =4a(10) =5a(11) =6a(12) =8a(13) =10a(14) =11a(15) =13a(16) =16a(17) =18a(18) =20a(19) =23a(20) =26a(21) =29a(22) =32a(23) =35a(24) =39a(25) =43a(26) =46a(27) =50a(28) =55a(29) =59