A340593 - cp's OEIS frontend

A340593 a(0) = 0; for n > 0, if n appears in the sequence then a(n) = a(n-1) - lastindex(n) if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + lastindex(n), where lastindex(n) is the index of the last appearance of n. Otherwise 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	5
4	9
5	6
6	11
7	4
8	12
9	8
10	18
11	24
12	16
13	29
14	15
15	29
16	17
17	33
18	23
19	42
20	22
21	43
22	63
23	45
24	34
25	59
26	85
27	58
28	30
29	45
30	73
31	104
32	72
33	55
34	31
35	66
36	102
37	65
38	27
39	66
40	26
41	67
42	48
43	69
44	25
45	54
46	100
47	53
48	95
49	46
50	96
51	147
52	199
53	152
54	107
55	74
56	130
57	187
58	160
59	135
60	75
61	14
62	76
63	98
64	162
65	125
66	86
67	127
68	195
69	238
70	168
71	97

[0, 1, 3, 5, 9, 6, 11, 4, 12, 8, 18, 24, 16, 29, 15, 29, 17, 33, 23, 42, 22, 43, 63, 45, 34, 59, 85, 58, 30, 45, 73, 104, 72, 55, 31, 66, 102, 65, 27, 66, 26, 67, 48, 69, 25, 54, 100, 53, 95, 46, 96, 147, 199, 152, 107, 74, 130, 187, 160, 135, 75, 14, 76, 98, 162, 125, 86, 127, 195, 238, 168, 97]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	5
4	9
5	6
6	11
7	4
8	12
9	8
10	18
11	24
12	16
13	29
14	15
15	29
16	17
17	33
18	23
19	42
20	22
21	43
22	63
23	45
24	34
25	59
26	85
27	58
28	30
29	45
30	73
31	104
32	72
33	55
34	31
35	66
36	102
37	65
38	27
39	66
40	26
41	67
42	48
43	69
44	25
45	54
46	100
47	53
48	95
49	46
50	96
51	147
52	199
53	152
54	107
55	74
56	130
57	187
58	160
59	135
60	75
61	14
62	76
63	98
64	162
65	125
66	86
67	127
68	195
69	238
70	168
71	97

n	a(n)
0	0
1	1
2	3
3	5
4	9
5	6
6	11
7	4
8	12
9	8
10	18
11	24
12	16
13	29
14	15
15	29
16	17
17	33
18	23
19	42
20	22
21	43
22	63
23	45
24	34
25	59
26	85
27	58
28	30
29	45
30	73
31	104
32	72
33	55
34	31
35	66
36	102
37	65
38	27
39	66
40	26
41	67
42	48
43	69
44	25
45	54
46	100
47	53
48	95
49	46
50	96
51	147
52	199
53	152
54	107
55	74
56	130
57	187
58	160
59	135
60	75
61	14
62	76
63	98
64	162
65	125
66	86
67	127
68	195
69	238
70	168
71	97

n	a(n)
0	0
1	1
2	3
3	5
4	9
5	6
6	11
7	4
8	12
9	8
10	18
11	24
12	16
13	29
14	15
15	29
16	17
17	33
18	23
19	42
20	22
21	43
22	63
23	45
24	34
25	59
26	85
27	58
28	30
29	45
30	73
31	104
32	72
33	55
34	31
35	66
36	102
37	65
38	27
39	66
40	26
41	67
42	48
43	69
44	25
45	54
46	100
47	53
48	95
49	46
50	96
51	147
52	199
53	152
54	107
55	74
56	130
57	187
58	160
59	135
60	75
61	14
62	76
63	98
64	162
65	125
66	86
67	127
68	195
69	238
70	168
71	97