Number of distinct sums i^3 + j^3 + k^3 + l^3 for 0<=i<=j<=k<=l<=n.

Terms

a(0) =1a(1) =5a(2) =15a(3) =35a(4) =69a(5) =123a(6) =192a(7) =297a(8) =450a(9) =636a(10) =874a(11) =1157a(12) =1442a(13) =1894a(14) =2430a(15) =3010a(16) =3606a(17) =4401a(18) =5320a(19) =6361a(20) =7571a(21) =8864a(22) =10277a(23) =11997a(24) =13621a(25) =15692a(26) =17922a(27) =20022a(28) =22742a(29) =25742