Shifts 3 places left under Euler transform with a(0)=0 and a(n)=1 for n < 3.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =5a(8) =8a(9) =14a(10) =23a(11) =40a(12) =69a(13) =121a(14) =212a(15) =378a(16) =672a(17) =1208a(18) =2177a(19) =3946a(20) =7173a(21) =13104a(22) =23995a(23) =44103a(24) =81261a(25) =150149a(26) =278054a(27) =516141a(28) =959952a(29) =1788950