A363962 - cp's OEIS frontend

A363962 a(1)=1; for n > 1, if n appears in the sequence then a(n) = lastindex(n), where lastindex(n) is the index of the last appearance of n. Otherwise a(n) = a(n-1) - n unless that result is already in the sequence or would be negative; otherwise, a(n) = a(n-1) * n.

n	a(n)
1	1
2	2
3	6
4	24
5	19
6	3
7	21
8	13
9	4
10	40
11	29
12	17
13	8
14	112
15	97
16	81
17	12
18	216
19	5
20	100
21	7
22	154
23	131
24	4
25	100
26	74
27	47
28	1316
29	11
30	330
31	299
32	267
33	234
34	200
35	165
36	129
37	92
38	54
39	15
40	10
41	410
42	368
43	325
44	281
45	236
46	190
47	27
48	1296
49	1247
50	1197
51	1146
52	1094
53	1041
54	38
55	2090
56	2034
57	1977
58	1919
59	1860
60	1800
61	1739
62	1677
63	1614

[1, 2, 6, 24, 19, 3, 21, 13, 4, 40, 29, 17, 8, 112, 97, 81, 12, 216, 5, 100, 7, 154, 131, 4, 100, 74, 47, 1316, 11, 330, 299, 267, 234, 200, 165, 129, 92, 54, 15, 10, 410, 368, 325, 281, 236, 190, 27, 1296, 1247, 1197, 1146, 1094, 1041, 38, 2090, 2034, 1977, 1919, 1860, 1800, 1739, 1677, 1614]

cp's OEIS Frontend

A363962 a(1)=1; for n > 1, if n appears in the sequence then a(n) = lastindex(n), where lastindex(n) is the index of the last appearance of n. Otherwise a(n) = a(n-1) - n unless that result is already in the sequence or would be negative; otherwise, a(n) = a(n-1) * n.

Table of values

List of values