Euler transform of reduced totient function psi(n), cf. A002322.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =13a(6) =21a(7) =37a(8) =58a(9) =96a(10) =153a(11) =243a(12) =376a(13) =584a(14) =897a(15) =1353a(16) =2046a(17) =3060a(18) =4552a(19) =6714a(20) =9862a(21) =14386a(22) =20898a(23) =30198a(24) =43427a(25) =62159a(26) =88600a(27) =125804a(28) =177881a(29) =250615