a(n) = n! * Sum_{k=0..n} binomial(2*n-2,k)/(n-k)!.
A380492
a(n) = n! * Sum_{k=0..n} binomial(2*n-2,k)/(n-k)!.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =73a(4) =1045a(5) =19081a(6) =424051a(7) =11109337a(8) =335262313a(9) =11453449105a(10) =436944953791
External references
- oeis: A380492