a(n) = A000041(n) - A032741(n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =8a(7) =14a(8) =19a(9) =28a(10) =39a(11) =55a(12) =72a(13) =100a(14) =132a(15) =173a(16) =227a(17) =296a(18) =380a(19) =489a(20) =622a(21) =789a(22) =999a(23) =1254a(24) =1568a(25) =1956a(26) =2433a(27) =3007a(28) =3713a(29) =4564