CIK (necklace, indistinct, unlabeled) transform of powers of 2.

Terms

a(0) =1a(1) =2a(2) =7a(3) =20a(4) =64a(5) =200a(6) =686a(7) =2324a(8) =8194a(9) =29084a(10) =104860a(11) =381116a(12) =1398148a(13) =5161592a(14) =19173958a(15) =71580752a(16) =268435474a(17) =1010572832a(18) =3817749138a(19) =14467230668a(20) =54975581488a(21) =209430687944a(22) =799644820114