Number of compositions (ordered partitions) of n into parts with an even number of distinct prime divisors.
A286225
Number of compositions (ordered partitions) of n into parts with an even number of distinct prime divisors.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =4a(9) =5a(10) =7a(11) =9a(12) =13a(13) =18a(14) =25a(15) =34a(16) =46a(17) =61a(18) =83a(19) =112a(20) =153a(21) =209a(22) =286a(23) =387a(24) =526a(25) =713a(26) =969a(27) =1317a(28) =1794a(29) =2437
External references
- oeis: A286225