a(3*n)=A001045(n+1), a(3*n+1)=A084214(n), a(3*n+2)=A000079(n) for n >= 0.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =4a(8) =4a(9) =5a(10) =6a(11) =8a(12) =11a(13) =14a(14) =16a(15) =21a(16) =26a(17) =32a(18) =43a(19) =54a(20) =64a(21) =85a(22) =106a(23) =128a(24) =171a(25) =214a(26) =256a(27) =341a(28) =426a(29) =512