a(n) = Sum_{k=0..n} (5*k+1) * binomial(4*n+k+1,n-k)/(4*n+k+1).
A390710
a(n) = Sum_{k=0..n} (5*k+1) * binomial(4*n+k+1,n-k)/(4*n+k+1).
Terms
- a(0) =1a(1) =2a(2) =11a(3) =73a(4) =528a(5) =4017a(6) =31607a(7) =254779a(8) =2091647a(9) =17420270a(10) =146780121a(11) =1248679940a(12) =10708942769a(13) =92478844907a(14) =803403848506
External references
- oeis: A390710