a(n) = Sum_{k=0..n} floor(sqrt(k))^5.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =35a(5) =67a(6) =99a(7) =131a(8) =163a(9) =406a(10) =649a(11) =892a(12) =1135a(13) =1378a(14) =1621a(15) =1864a(16) =2888a(17) =3912a(18) =4936a(19) =5960a(20) =6984a(21) =8008a(22) =9032a(23) =10056a(24) =11080a(25) =14205a(26) =17330a(27) =20455a(28) =23580a(29) =26705