a(n) = Sum_{k=0..n} (-1)^k * (4*k+1) * binomial(5*n-k+1,n-k)/(5*n-k+1).
A390744
a(n) = Sum_{k=0..n} (-1)^k * (4*k+1) * binomial(5*n-k+1,n-k)/(5*n-k+1).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =8a(4) =69a(5) =632a(6) =6051a(7) =59880a(8) =607773a(9) =6293288a(10) =66224226a(11) =706189464a(12) =7614671751a(13) =82885389888a(14) =909547563848
External references
- oeis: A390744