Do you have any ideas?

[royal stone]

this series converges on ¼ if you continue it, and is the sum of:
1/(n(n+1)(n+2)) from 1→10, expanding this gives you (a(a+3))/(4(a+1)(a+2)) where a is the number of terms

[weary dawn]

(i just thought of this as a different method so i shared)

[arctic wraith]

O, yeah, thank you, I waited something like that