A121256 - cp's OEIS frontend

A121256 a(n) = a(n-1)*a(n-3) - 1, starting with a(0)=a(1)=a(2)=2.

n	a(n)
0	2
1	2
2	2
3	3
4	5
5	9
6	26
7	129
8	1160
9	30159
10	3890510
11	4512991599
12	136107313634240
13	529526864767147062399
14	2389750292138943783804215786000
15	325262492519671886357848434144628838112639999

[2, 2, 2, 3, 5, 9, 26, 129, 1160, 30159, 3890510, 4512991599, 136107313634240, 529526864767147062399, 2389750292138943783804215786000, 325262492519671886357848434144628838112639999]

cp's OEIS Frontend

A121256 a(n) = a(n-1)*a(n-3) - 1, starting with a(0)=a(1)=a(2)=2.

Table of values

List of values