a(n) = Sum_{k=0..n} (-1)^k * binomial(n+k-1,k) * binomial(5*n-k-1,n-k).
A370105
a(n) = Sum_{k=0..n} (-1)^k * binomial(n+k-1,k) * binomial(5*n-k-1,n-k).
Terms
- a(0) =1a(1) =3a(2) =23a(3) =192a(4) =1687a(5) =15253a(6) =140504a(7) =1311292a(8) =12357015a(9) =117318162a(10) =1120436273a(11) =10752242592a(12) =103596191608
External references
- oeis: A370105