a(0)=1. a(n) = Sum_{k=1..n} a(n-d(k)), where d(k) = A000005(k) (the number of positive divisors of k).
A135346
a(0)=1. a(n) = Sum_{k=1..n} a(n-d(k)), where d(k) = A000005(k) (the number of positive divisors of k).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =23a(6) =56a(7) =161a(8) =426a(9) =1228a(10) =3422a(11) =10897a(12) =31797a(13) =107868a(14) =334558a(15) =1101073a(16) =3497461a(17) =12456122a(18) =40984747a(19) =153684304a(20) =526066576a(21) =1919047914a(22) =6744790864a(23) =26222498483a(24) =94726314125a(25) =365396084072
External references
- oeis: A135346