a(n)= n! - (n-1)!! - a(n-1), with a(1)=1!-0!!=0.
A129547
a(n)= n! - (n-1)!! - a(n-1), with a(1)=1!-0!!=0.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =18a(4) =94a(5) =611a(6) =4381a(7) =35834a(8) =326662a(9) =3301193a(10) =36611767a(11) =442379438a(12) =5784595282a(13) =81393560783
External references
- oeis: A129547