Pseudo-factorials: a(0)=1, a(n+1) = (-1)^(n+1) * Sum_{k=0..n} binomial(n,k) * a(k)*a(n-k), n>=0.
A098777
Pseudo-factorials: a(0)=1, a(n+1) = (-1)^(n+1) * Sum_{k=0..n} binomial(n,k) * a(k)*a(n-k), n>=0.
Terms
- a(0) =1a(1) =-1a(2) =-2a(3) =2a(4) =16a(5) =-40a(6) =-320a(7) =1040a(8) =12160a(9) =-52480a(10) =-742400a(11) =3872000a(12) =66457600a(13) =-411136000a(14) =-8202444800a(15) =58479872000
External references
- oeis: A098777