Sum of all parts of all partitions of n minus the number of partitions of n.

Terms

a(0) =0a(1) =2a(2) =6a(3) =15a(4) =28a(5) =55a(6) =90a(7) =154a(8) =240a(9) =378a(10) =560a(11) =847a(12) =1212a(13) =1755a(14) =2464a(15) =3465a(16) =4752a(17) =6545a(18) =8820a(19) =11913a(20) =15840a(21) =21042a(22) =27610a(23) =36225a(24) =46992a(25) =60900a(26) =78260a(27) =100386a(28) =127820a(29) =162516