Partial sums of A299258.

Terms

a(0) =1a(1) =6a(2) =19a(3) =44a(4) =85a(5) =147a(6) =236a(7) =357a(8) =514a(9) =711a(10) =953a(11) =1246a(12) =1595a(13) =2004a(14) =2477a(15) =3019a(16) =3636a(17) =4333a(18) =5114a(19) =5983a(20) =6945a(21) =8006a(22) =9171a(23) =10444a(24) =11829a(25) =13331a(26) =14956a(27) =16709a(28) =18594a(29) =20615