Number of 3's in all partitions of n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =4a(6) =6a(7) =9a(8) =15a(9) =21a(10) =31a(11) =45a(12) =63a(13) =87a(14) =122a(15) =164a(16) =222a(17) =298a(18) =395a(19) =519a(20) =683a(21) =885a(22) =1146a(23) =1475a(24) =1887a(25) =2401a(26) =3050a(27) =3845a(28) =4837a(29) =6060