a(n)= 2F2(n+1, n+2; 1, 2; 1) *n! *(n+1)! /exp(1), where 2F2 is the generalized hypergeometric function.
A070074
a(n)= 2F2(n+1, n+2; 1, 2; 1) *n! *(n+1)! /exp(1), where 2F2 is the generalized hypergeometric function.
Terms
- a(0) =1a(1) =7a(2) =141a(3) =5305a(4) =313333a(5) =26405391a(6) =2986704817a(7) =434460962041
External references
- oeis: A070074