Molien series for 3-dimensional group [2+,n] = 2*(n/2).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =10a(7) =13a(8) =16a(9) =19a(10) =22a(11) =26a(12) =30a(13) =34a(14) =39a(15) =44a(16) =49a(17) =54a(18) =60a(19) =66a(20) =72a(21) =79a(22) =86a(23) =93a(24) =100a(25) =108a(26) =116a(27) =124a(28) =133a(29) =142