Partial sums of A024770.

Terms

a(0) =2a(1) =5a(2) =10a(3) =17a(4) =40a(5) =69a(6) =100a(7) =137a(8) =190a(9) =249a(10) =320a(11) =393a(12) =472a(13) =705a(14) =944a(15) =1237a(16) =1548a(17) =1861a(18) =2178a(19) =2551a(20) =2930a(21) =3523a(22) =4122a(23) =4841a(24) =5574a(25) =6313a(26) =7110a(27) =9443a(28) =11782a(29) =14175