a(n) = phi(Padovan(n+4)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =4a(8) =6a(9) =6a(10) =4a(11) =8a(12) =12a(13) =12a(14) =36a(15) =42a(16) =48a(17) =42a(18) =36a(19) =150a(20) =80a(21) =208a(22) =216a(23) =240a(24) =240a(25) =256a(26) =1012a(27) =712a(28) =1620a(29) =2148