Partial sums of A071619.

Terms

a(0) =0a(1) =1a(2) =4a(3) =10a(4) =21a(5) =38a(6) =62a(7) =95a(8) =138a(9) =192a(10) =259a(11) =340a(12) =436a(13) =549a(14) =680a(15) =830a(16) =1001a(17) =1194a(18) =1410a(19) =1651a(20) =1918a(21) =2212a(22) =2535a(23) =2888a(24) =3272a(25) =3689a(26) =4140a(27) =4626a(28) =5149a(29) =5710