a(n) = (-1)^(n+1)*6*(36^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.
A090646
a(n) = (-1)^(n+1)*6*(36^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.
Terms
- a(0) =0a(1) =35a(2) =259a(3) =6665a(4) =335923a(5) =27484625a(6) =3305838667a(7) =548549148665
External references
- oeis: A090646