Number of distinct sums i^3 + j^3 + k^3 + l^3 for 1<=i<=j<=k<=l<=n.

Terms

a(0) =1a(1) =5a(2) =15a(3) =35a(4) =70a(5) =119a(6) =202a(7) =317a(8) =473a(9) =671a(10) =902a(11) =1138a(12) =1515a(13) =2008a(14) =2521a(15) =3039a(16) =3758a(17) =4592a(18) =5539a(19) =6657a(20) =7879a(21) =9209a(22) =10797a(23) =12304a(24) =14243a(25) =16371a(26) =18348a(27) =21006a(28) =23816a(29) =26563