Number of binary partitions of n into three kinds of parts.

Terms

a(0) =1a(1) =3a(2) =9a(3) =19a(4) =42a(5) =78a(6) =146a(7) =246a(8) =420a(9) =668a(10) =1068a(11) =1620a(12) =2470a(13) =3618a(14) =5310a(15) =7546a(16) =10746a(17) =14910a(18) =20706a(19) =28134a(20) =38262a(21) =51090a(22) =68238a(23) =89706a(24) =117964a(25) =153012a(26) =198468a(27) =254332a(28) =325914a(29) =413214