A117823 - cp's OEIS frontend

A117823 a(0) = 0, a(1) = 1; for n >= 2, a(n) = a(n-1) + a(n-2) - n if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + a(n-2) + n.

n	a(n)
0	0
1	1
2	3
3	7
4	6
5	8
6	20
7	21
8	33
9	45
10	68
11	102
12	158
13	247
14	391
15	623
16	998
17	1604
18	2584
19	4169
20	6733
21	10881
22	17592
23	28450
24	46018
25	74443
26	120435
27	194851
28	315258
29	510080
30	825308
31	1335357
32	2160633
33	3495957
34	5656556
35	9152478
36	14808998
37	23961439
38	38770399

[0, 1, 3, 7, 6, 8, 20, 21, 33, 45, 68, 102, 158, 247, 391, 623, 998, 1604, 2584, 4169, 6733, 10881, 17592, 28450, 46018, 74443, 120435, 194851, 315258, 510080, 825308, 1335357, 2160633, 3495957, 5656556, 9152478, 14808998, 23961439, 38770399]

cp's OEIS Frontend

A117823 a(0) = 0, a(1) = 1; for n >= 2, a(n) = a(n-1) + a(n-2) - n if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + a(n-2) + n.

Table of values

List of values