Number of twice-partitions of n with no repeated partitions.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =10a(5) =20a(6) =40a(7) =77a(8) =157a(9) =285a(10) =552a(11) =1018a(12) =1921a(13) =3484a(14) =6436a(15) =11622a(16) =21082a(17) =37550a(18) =67681a(19) =119318a(20) =211792a(21) =372003a(22) =653496a(23) =1137185a(24) =1986234a(25) =3429650a(26) =5935970a(27) =10205907a(28) =17537684a(29) =29958671