A174562 - cp's OEIS frontend

A174562 a(1)=2, a(2)=3, then a(n)=a(n-1)+a(n-2) if n odd, a(n)=a(n-1)-a(n-2) if n even.

n	a(n)
1	2
2	3
3	5
4	2
5	7
6	5
7	12
8	7
9	19
10	12
11	31
12	19
13	50
14	31
15	81
16	50
17	131
18	81
19	212
20	131
21	343
22	212
23	555
24	343
25	898
26	555
27	1453
28	898
29	2351
30	1453
31	3804
32	2351
33	6155
34	3804
35	9959
36	6155
37	16114
38	9959
39	26073
40	16114
41	42187
42	26073
43	68260
44	42187
45	110447
46	68260
47	178707
48	110447

[2, 3, 5, 2, 7, 5, 12, 7, 19, 12, 31, 19, 50, 31, 81, 50, 131, 81, 212, 131, 343, 212, 555, 343, 898, 555, 1453, 898, 2351, 1453, 3804, 2351, 6155, 3804, 9959, 6155, 16114, 9959, 26073, 16114, 42187, 26073, 68260, 42187, 110447, 68260, 178707, 110447]

cp's OEIS Frontend

A174562 a(1)=2, a(2)=3, then a(n)=a(n-1)+a(n-2) if n odd, a(n)=a(n-1)-a(n-2) if n even.

Table of values

List of values