a(0) = 1, a(1) = 2, a(2) = 3; for n >= 3, a(n) = a(n-2) + a(n-1)*Product_{i=1..n-3} a(i).
A001685
a(0) = 1, a(1) = 2, a(2) = 3; for n >= 3, a(n) = a(n-2) + a(n-1)*Product_{i=1..n-3} a(i).
Terms
- a(0) =1a(1) =2a(2) =3a(3) =5a(4) =13a(5) =83a(6) =2503a(7) =976253a(8) =31601312113
External references
- oeis: A001685