Number of compositions (ordered partitions) of n into odd primes (including 1).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =8a(7) =13a(8) =21a(9) =33a(10) =53a(11) =86a(12) =138a(13) =222a(14) =357a(15) =573a(16) =921a(17) =1481a(18) =2381a(19) =3828a(20) =6153a(21) =9890a(22) =15898a(23) =25556a(24) =41082a(25) =66039a(26) =106156a(27) =170644a(28) =274307a(29) =440945