A340733 - cp's OEIS frontend

A340733 a(0) = 0; for n > 0, if the value of n itself appears in the sequence then a(n) = a(n-1) - (n-index(n)) if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + (n-index(n)), where index(n) is the index of the last appearance of n. If the value of n does not appear then a(n) = a(n-1) - n if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + n.

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	9
7	16
8	8
9	5
10	15
11	21
12	33
13	20
14	34
15	29
16	38
17	55
18	37
19	18
20	25
21	35
22	13
23	36
24	12
25	7
26	33
27	60
28	32
29	46
30	76
31	45
32	41
33	48
34	28
35	14
36	27
37	46
38	24
39	63
40	23
41	32
42	74
43	31
44	75
45	61
46	52
47	99
48	84
49	133
50	83
51	134
52	128
53	181
54	127
55	89
56	145
57	88
58	30
59	89
60	56
61	40
62	102
63	78
64	142
65	77
66	143
67	210
68	278
69	209
70	139
71	68

[0, 1, 3, 2, 6, 11, 9, 16, 8, 5, 15, 21, 33, 20, 34, 29, 38, 55, 37, 18, 25, 35, 13, 36, 12, 7, 33, 60, 32, 46, 76, 45, 41, 48, 28, 14, 27, 46, 24, 63, 23, 32, 74, 31, 75, 61, 52, 99, 84, 133, 83, 134, 128, 181, 127, 89, 145, 88, 30, 89, 56, 40, 102, 78, 142, 77, 143, 210, 278, 209, 139, 68]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	9
7	16
8	8
9	5
10	15
11	21
12	33
13	20
14	34
15	29
16	38
17	55
18	37
19	18
20	25
21	35
22	13
23	36
24	12
25	7
26	33
27	60
28	32
29	46
30	76
31	45
32	41
33	48
34	28
35	14
36	27
37	46
38	24
39	63
40	23
41	32
42	74
43	31
44	75
45	61
46	52
47	99
48	84
49	133
50	83
51	134
52	128
53	181
54	127
55	89
56	145
57	88
58	30
59	89
60	56
61	40
62	102
63	78
64	142
65	77
66	143
67	210
68	278
69	209
70	139
71	68

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	9
7	16
8	8
9	5
10	15
11	21
12	33
13	20
14	34
15	29
16	38
17	55
18	37
19	18
20	25
21	35
22	13
23	36
24	12
25	7
26	33
27	60
28	32
29	46
30	76
31	45
32	41
33	48
34	28
35	14
36	27
37	46
38	24
39	63
40	23
41	32
42	74
43	31
44	75
45	61
46	52
47	99
48	84
49	133
50	83
51	134
52	128
53	181
54	127
55	89
56	145
57	88
58	30
59	89
60	56
61	40
62	102
63	78
64	142
65	77
66	143
67	210
68	278
69	209
70	139
71	68

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	9
7	16
8	8
9	5
10	15
11	21
12	33
13	20
14	34
15	29
16	38
17	55
18	37
19	18
20	25
21	35
22	13
23	36
24	12
25	7
26	33
27	60
28	32
29	46
30	76
31	45
32	41
33	48
34	28
35	14
36	27
37	46
38	24
39	63
40	23
41	32
42	74
43	31
44	75
45	61
46	52
47	99
48	84
49	133
50	83
51	134
52	128
53	181
54	127
55	89
56	145
57	88
58	30
59	89
60	56
61	40
62	102
63	78
64	142
65	77
66	143
67	210
68	278
69	209
70	139
71	68