Number of compositions (ordered partitions) of n into unitary divisors of n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =2a(5) =2a(6) =25a(7) =2a(8) =2a(9) =2a(10) =129a(11) =2a(12) =170a(13) =2a(14) =742a(15) =450a(16) =2a(17) =2a(18) =4603a(19) =2a(20) =1503a(21) =3321a(22) =29967a(23) =2a(24) =9278a(25) =2a(26) =200390a(27) =2a(28) =13460a(29) =2