a(n) = (1/(2*n+1)) * Sum_{k=0..n} (2*k+1) * binomial(4*n+2,n-k).
A390776
a(n) = (1/(2*n+1)) * Sum_{k=0..n} (2*k+1) * binomial(4*n+2,n-k).
Terms
- a(0) =1a(1) =3a(2) =16a(3) =102a(4) =712a(5) =5255a(6) =40288a(7) =317548a(8) =2556376a(9) =20926236a(10) =173634752a(11) =1456967358a(12) =12341344216a(13) =105384541314a(14) =906188676224
External references
- oeis: A390776