A001685 - cp's OEIS frontend

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).

n	a(n)
0	1
1	2
2	3
3	5
4	13
5	83
6	2503
7	976253
8	31601312113
9	2560404986164794683
10	202523113189037952478722304798003
11	506227391211661106785411233681995783881012463859772443053

[1, 2, 3, 5, 13, 83, 2503, 976253, 31601312113, 2560404986164794683, 202523113189037952478722304798003, 506227391211661106785411233681995783881012463859772443053]

cp's OEIS Frontend

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).

Table of values

List of values