Sum of all parts minus the total numbers of parts of all partitions of n.

Terms

a(0) =0a(1) =1a(2) =3a(3) =8a(4) =15a(5) =31a(6) =51a(7) =90a(8) =142a(9) =228a(10) =341a(11) =525a(12) =757a(13) =1110a(14) =1572a(15) =2233a(16) =3084a(17) =4286a(18) =5812a(19) =7910a(20) =10580a(21) =14145a(22) =18659a(23) =24626a(24) =32099a(25) =41814a(26) =53976a(27) =69559a(28) =88932a(29) =113557