A117824 - cp's OEIS frontend

A117824 a(0) = 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	0
1	1
2	2
3	5
4	4
5	13
6	12
7	19
8	24
9	35
10	50
11	75
12	114
13	177
14	278
15	441
16	704
17	1129
18	1816
19	2927
20	4724
21	7631
22	12334
23	19943
24	32254
25	52173
26	84402
27	136549
28	220924
29	357445
30	578340
31	935755
32	1514064
33	2449787
34	3963818
35	6413571
36	10377354
37	16790889
38	27168206
39	43959057

[0, 1, 2, 5, 4, 13, 12, 19, 24, 35, 50, 75, 114, 177, 278, 441, 704, 1129, 1816, 2927, 4724, 7631, 12334, 19943, 32254, 52173, 84402, 136549, 220924, 357445, 578340, 935755, 1514064, 2449787, 3963818, 6413571, 10377354, 16790889, 27168206, 43959057]

cp's OEIS Frontend

A117824 a(0) = 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