a(0)=1; thereafter a(n) = n! + Sum_{i=0..n-1} a(i)*a(n-1-i).
A229741
a(0)=1; thereafter a(n) = n! + Sum_{i=0..n-1} a(i)*a(n-1-i).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =92a(5) =428a(6) =2208a(7) =12756a(8) =83848a(9) =635392a(10) =5563952a(11) =55743168a(12) =628294912a(13) =7832530400a(14) =106515280064
External references
- oeis: A229741