Partial sums of A002522, starting at n=1.

Terms

a(0) =2a(1) =7a(2) =17a(3) =34a(4) =60a(5) =97a(6) =147a(7) =212a(8) =294a(9) =395a(10) =517a(11) =662a(12) =832a(13) =1029a(14) =1255a(15) =1512a(16) =1802a(17) =2127a(18) =2489a(19) =2890a(20) =3332a(21) =3817a(22) =4347a(23) =4924a(24) =5550a(25) =6227a(26) =6957a(27) =7742a(28) =8584a(29) =9485