Total number of parts in all partitions of n. Also, sum of largest parts of all partitions of n.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =12a(5) =20a(6) =35a(7) =54a(8) =86a(9) =128a(10) =192a(11) =275a(12) =399a(13) =556a(14) =780a(15) =1068a(16) =1463a(17) =1965a(18) =2644a(19) =3498a(20) =4630a(21) =6052a(22) =7899a(23) =10206a(24) =13174a(25) =16851a(26) =21522a(27) =27294a(28) =34545a(29) =43453