a(1) = 1, a(2) = 2; for n > 2, a(n) = {a(n-1) +a(n+1)}/n or a(n+1) = n*a(n)-a(n-1).
A074189
a(1) = 1, a(2) = 2; for n > 2, a(n) = {a(n-1) +a(n+1)}/n or a(n+1) = n*a(n)-a(n-1).
Terms
- a(0) =-1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =25a(6) =118a(7) =683a(8) =4663a(9) =36621a(10) =324926a(11) =3212639a(12) =35014103a(13) =416956597a(14) =5385421658a(15) =74978946615
External references
- oeis: A074189