a(n) = Sum_{i=1..n} C(i+6,7)^3.

A086030

a(n) = Sum_{i=1..n} C(i+6,7)^3.

Terms

    a(0) =1a(1) =513a(2) =47169a(3) =1775169a(4) =37712169a(5) =534505257a(6) =5587534953a(7) =46011772521a(8) =312480135396

External references