Euler transform of Euler totient function phi(n), cf. A000010.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =13a(6) =21a(7) =37a(8) =60a(9) =98a(10) =157a(11) =251a(12) =392a(13) =612a(14) =943a(15) =1439a(16) =2187a(17) =3293a(18) =4930a(19) =7330a(20) =10839a(21) =15935a(22) =23315a(23) =33933a(24) =49170a(25) =70914a(26) =101861a(27) =145713a(28) =207638a(29) =294796