Number of toroidal necklaces of positive integers summing to n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =10a(5) =14a(6) =31a(7) =44a(8) =90a(9) =154a(10) =296a(11) =524a(12) =1035a(13) =1881a(14) =3636a(15) =6869a(16) =13208a(17) =25150a(18) =48585a(19) =93188a(20) =180192a(21) =347617a(22) =673201a(23) =1303259a(24) =2529740a(25) =4910708a(26) =9549665a(27) =18579828a(28) =36192118a(29) =70540863