Shifts left 2 places under "DGK" (bracelet, element, unlabeled) transform.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =6a(8) =10a(9) =17a(10) =29a(11) =53a(12) =93a(13) =169a(14) =308a(15) =566a(16) =1068a(17) =1975a(18) =3742a(19) =7061a(20) =13427a(21) =25634a(22) =49151a(23) =94474a(24) =182262a(25) =352361a(26) =683304a(27) =1327941a(28) =2586839a(29) =5049398