a(n) = Sum_{k=0..n} binomial(4*n+2,5*k).
A387905
a(n) = Sum_{k=0..n} binomial(4*n+2,5*k).
Terms
- a(0) =1a(1) =7a(2) =254a(3) =3004a(4) =53143a(5) =843756a(6) =13333932a(7) =215492564a(8) =3431847189a(9) =54986385093a(10) =879683351911
External references
- oeis: A387905