a(n) = 4^n * (n!)^2 * Sum_{k=0..n} 1 / ((-4)^k * (k!)^2).
A337154
a(n) = 4^n * (n!)^2 * Sum_{k=0..n} 1 / ((-4)^k * (k!)^2).
Terms
- a(0) =1a(1) =3a(2) =49a(3) =1763a(4) =112833a(5) =11283299a(6) =1624795057a(7) =318459831171
External references
- oeis: A337154