Number of conjugacy classes in the symmetric group S_n that have even number of elements.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =5a(5) =7a(6) =11a(7) =20a(8) =28a(9) =38a(10) =52a(11) =73a(12) =97a(13) =127a(14) =168a(15) =229a(16) =295a(17) =381a(18) =486a(19) =623a(20) =788a(21) =994a(22) =1247a(23) =1571a(24) =1954a(25) =2428a(26) =3002a(27) =3710a(28) =4557a(29) =5588