Number of parts in all partitions of n in which no part occurs more than four times.

Terms

a(0) =1a(1) =3a(2) =6a(3) =12a(4) =15a(5) =29a(6) =41a(7) =65a(8) =91a(9) =132a(10) =179a(11) =257a(12) =339a(13) =465a(14) =616a(15) =823a(16) =1062a(17) =1402a(18) =1790a(19) =2320a(20) =2939a(21) =3750a(22) =4701a(23) =5946a(24) =7398a(25) =9243a(26) =11428a(27) =14161a(28) =17368a(29) =21372