a(0)=a(1)=-1. For n>1: a(n)=Sum(i!i^2 Stirling2[n-1,i],i=2,..,n-1).
A091106
a(0)=a(1)=-1. For n>1: a(n)=Sum(i!i^2 Stirling2[n-1,i],i=2,..,n-1).
Terms
- a(0) =-1a(1) =-1a(2) =0a(3) =8a(4) =78a(5) =764a(6) =8310a(7) =100988a(8) =1362438a(9) =20246444a(10) =328972470a(11) =5805917468a(12) =110645911398
External references
- oeis: A091106