a(n) = n! * (n+1)! * Sum_{k=0..n} (-1)^k/(k! * (k+1)!).
A368853
a(n) = n! * (n+1)! * Sum_{k=0..n} (-1)^k/(k! * (k+1)!).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =83a(4) =1661a(5) =49829a(6) =2092819a(7) =117197863a(8) =8438246137a(9) =759442152329
External references
- oeis: A368853