Sum of numbers in n-th upward diagonal of triangle in A079823.

Terms

a(0) =1a(1) =2a(2) =7a(3) =12a(4) =25a(5) =37a(6) =62a(7) =84a(8) =125a(9) =160a(10) =221a(11) =272a(12) =357a(13) =427a(14) =540a(15) =632a(16) =777a(17) =894a(18) =1075a(19) =1220a(20) =1441a(21) =1617a(22) =1882a(23) =2092a(24) =2405a(25) =2652a(26) =3017a(27) =3304a(28) =3725a(29) =4055