a(n) = Sum_{k=0..n} (-1)^k * (3*k+1) * binomial(5*n-2*k+1,n-k)/(5*n-2*k+1).
A390743
a(n) = Sum_{k=0..n} (-1)^k * (3*k+1) * binomial(5*n-2*k+1,n-k)/(5*n-2*k+1).
Terms
- a(0) =1a(1) =0a(2) =2a(3) =15a(4) =128a(5) =1166a(6) =11129a(7) =109911a(8) =1114030a(9) =11523655a(10) =121168956a(11) =1291306328a(12) =13916949253a(13) =151423573995
External references
- oeis: A390743