Partial sums of A003325.

Terms

a(0) =2a(1) =11a(2) =27a(3) =55a(4) =90a(5) =144a(6) =209a(7) =281a(8) =372a(9) =498a(10) =626a(11) =759a(12) =911a(13) =1100a(14) =1317a(15) =1541a(16) =1784a(17) =2034a(18) =2314a(19) =2655a(20) =2999a(21) =3350a(22) =3720a(23) =4127a(24) =4559a(25) =5027a(26) =5540a(27) =6060a(28) =6599a(29) =7158