A117822 - cp's OEIS frontend

A117822 a(0) = a(1) = 1; for n >= 2, a(n) = a(n-1) + a(n-2) - (n-1) if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + a(n-2) + (n-1).

n	a(n)
0	1
1	1
2	3
3	2
4	8
5	6
6	9
7	21
8	23
9	36
10	50
11	76
12	115
13	179
14	281
15	446
16	712
17	1142
18	1837
19	2961
20	4779
21	7720
22	12478
23	20176
24	32631
25	52783
26	85389
27	138146
28	223508
29	361626
30	585105
31	946701
32	1531775
33	2478444
34	4010186
35	6488596
36	10498747
37	16987307
38	27486017
39	44473286

[1, 1, 3, 2, 8, 6, 9, 21, 23, 36, 50, 76, 115, 179, 281, 446, 712, 1142, 1837, 2961, 4779, 7720, 12478, 20176, 32631, 52783, 85389, 138146, 223508, 361626, 585105, 946701, 1531775, 2478444, 4010186, 6488596, 10498747, 16987307, 27486017, 44473286]

cp's OEIS Frontend

A117822 a(0) = a(1) = 1; for n >= 2, a(n) = a(n-1) + a(n-2) - (n-1) if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + a(n-2) + (n-1).

Table of values

List of values