Partial sums of A000960.

Terms

a(0) =1a(1) =4a(2) =11a(3) =24a(4) =43a(5) =70a(6) =109a(7) =158a(8) =221a(9) =300a(10) =391a(11) =500a(12) =633a(13) =780a(14) =961a(15) =1168a(16) =1391a(17) =1644a(18) =1933a(19) =2240a(20) =2589a(21) =2976a(22) =3375a(23) =3834a(24) =4315a(25) =4844a(26) =5411a(27) =6024a(28) =6673a(29) =7382