a(n) = Sum_{k=0..n} binomial(5*n+k+1,n-k).
A390334
a(n) = Sum_{k=0..n} binomial(5*n+k+1,n-k).
Terms
- a(0) =1a(1) =7a(2) =68a(3) =715a(4) =7803a(5) =87043a(6) =985193a(7) =11267400a(8) =129874340a(9) =1506178906a(10) =17553447669a(11) =205400423279
External references
- oeis: A390334