Number of sequences b with last index n with b(0) = 1, b(i+1) = b(i)+d where d|b(i).
A122206
Number of sequences b with last index n with b(0) = 1, b(i+1) = b(i)+d where d|b(i).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =66a(6) =307a(7) =1619a(8) =9668a(9) =64112a(10) =469936a(11) =3773496a(12) =32997159a(13) =312542002a(14) =3192352420a(15) =35023164817a(16) =411288004670
External references
- oeis: A122206