Partial sums of A068148.

Terms

a(0) =2a(1) =5a(2) =10a(3) =17a(4) =28a(5) =51a(6) =94a(7) =161a(8) =250a(9) =351a(10) =460a(11) =671a(12) =894a(13) =1127a(14) =1560a(15) =2003a(16) =2680a(17) =3467a(18) =4344a(19) =5231a(20) =6240a(21) =7349a(22) =8472a(23) =9695a(24) =11806a(25) =14027a(26) =16360a(27) =19581a(28) =22904a(29) =26247