a(0) is the first term of A000040; a(1) is the first term of A001359; a(2) is the first term of A046136; a(3) is the first term of A097434; a(4) is the first term of A097436; a(5) is the first term of A097437; a(6) is the first term of A097458; a(7) is the first term of A097459; a(8) is the first term of A097460; a(9) is the first term of A097461.