a(n) = Sum_{k=0..n} (-1)^k * (2*k+1) * binomial(4*n-2*k+1,n-k)/(4*n-2*k+1).
A390740
a(n) = Sum_{k=0..n} (-1)^k * (2*k+1) * binomial(4*n-2*k+1,n-k)/(4*n-2*k+1).
Terms
- a(0) =1a(1) =0a(2) =2a(3) =11a(4) =73a(5) =516a(6) =3825a(7) =29344a(8) =231050a(9) =1856679a(10) =15166101a(11) =125557710a(12) =1051197507a(13) =8884941534a(14) =75712772251a(15) =649768843803
External references
- oeis: A390740