G.f.: A(x) = exp( Sum_{n>=1} A069865(n)/2*x^n/n ) where A069865(n) = Sum_{k=0..n} C(n,k)^6.
A218120
G.f.: A(x) = exp( Sum_{n>=1} A069865(n)/2*x^n/n ) where A069865(n) = Sum_{k=0..n} C(n,k)^6.
Terms
- a(0) =1a(1) =1a(2) =17a(3) =260a(4) =7244a(5) =214257a(6) =7593707a(7) =287419304a(8) =11745920475a(9) =503237634257
External references
- oeis: A218120