Shifts left 2 places under "BHK" (reversible, identity, unlabeled) transform.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =8a(7) =16a(8) =40a(9) =89a(10) =214a(11) =498a(12) =1194a(13) =2849a(14) =6890a(15) =16706a(16) =40820a(17) =100134a(18) =246930a(19) =611215a(20) =1518972a(21) =3787278a(22) =9473250a(23) =23762348a(24) =59763611a(25) =150670704a(26) =380716008a(27) =963993526a(28) =2445626469a(29) =6215681848