A117821 - cp's OEIS frontend

A117821 a(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	1
1	1
2	4
3	2
4	10
5	7
6	11
7	25
8	28
9	44
10	62
11	95
12	145
13	227
14	358
15	570
16	912
17	1465
18	2359
19	3805
20	6144
21	9928
22	16050
23	25955
24	41981
25	67911
26	109866
27	177750
28	287588
29	465309
30	752867
31	1218145
32	1970980
33	3189092
34	5160038
35	8349095
36	13509097
37	21858155
38	35367214

[1, 1, 4, 2, 10, 7, 11, 25, 28, 44, 62, 95, 145, 227, 358, 570, 912, 1465, 2359, 3805, 6144, 9928, 16050, 25955, 41981, 67911, 109866, 177750, 287588, 465309, 752867, 1218145, 1970980, 3189092, 5160038, 8349095, 13509097, 21858155, 35367214]

cp's OEIS Frontend

A117821 a(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