Number of palindromic compositions of n into nonprime numbers.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =3a(7) =1a(8) =5a(9) =3a(10) =7a(11) =4a(12) =11a(13) =6a(14) =16a(15) =9a(16) =25a(17) =14a(18) =38a(19) =21a(20) =59a(21) =34a(22) =89a(23) =50a(24) =137a(25) =77a(26) =208a(27) =117a(28) =319a(29) =180