"EFK" (unordered, size, unlabeled) transform of 2,4,6,8,...

Terms

a(0) =1a(1) =2a(2) =4a(3) =14a(4) =20a(5) =50a(6) =112a(7) =190a(8) =328a(9) =666a(10) =1340a(11) =2038a(12) =3740a(13) =5954a(14) =10792a(15) =19542a(16) =30048a(17) =48290a(18) =80164a(19) =124694a(20) =204484a(21) =347610a(22) =515184a(23) =810750a(24) =1240296a(25) =1932722a(26) =2887820a(27) =4557838a(28) =7126652a(29) =10463330