Partial sums of A007585.

Terms

a(0) =1a(1) =12a(2) =50a(3) =140a(4) =315a(5) =616a(6) =1092a(7) =1800a(8) =2805a(9) =4180a(10) =6006a(11) =8372a(12) =11375a(13) =15120a(14) =19720a(15) =25296a(16) =31977a(17) =39900a(18) =49210a(19) =60060a(20) =72611a(21) =87032a(22) =103500a(23) =122200a(24) =143325a(25) =167076a(26) =193662a(27) =223300a(28) =256215a(29) =292640