A380820 - cp's OEIS frontend

A380820 a(0) = 0, a(1) = 1, and for n >= 2, a(n) = a(n-1) + a(n-2) if a(n-1) < n, otherwise a(n-1) - n.

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	5
6	8
7	1
8	9
9	0
10	9
11	9
12	18
13	5
14	23
15	8
16	31
17	14
18	45
19	26
20	6
21	32
22	10
23	42
24	18
25	60
26	34
27	7
28	41
29	12
30	53
31	22
32	75
33	42
34	8
35	50
36	14
37	64
38	26
39	90
40	50
41	9
42	59
43	16
44	75
45	30
46	105
47	58
48	10
49	68
50	18
51	86
52	34
53	120
54	66
55	11
56	77
57	20
58	97
59	38
60	135
61	74
62	12
63	86
64	22
65	108
66	42
67	150

[0, 1, 1, 2, 3, 5, 8, 1, 9, 0, 9, 9, 18, 5, 23, 8, 31, 14, 45, 26, 6, 32, 10, 42, 18, 60, 34, 7, 41, 12, 53, 22, 75, 42, 8, 50, 14, 64, 26, 90, 50, 9, 59, 16, 75, 30, 105, 58, 10, 68, 18, 86, 34, 120, 66, 11, 77, 20, 97, 38, 135, 74, 12, 86, 22, 108, 42, 150]

cp's OEIS Frontend

A380820 a(0) = 0, a(1) = 1, and for n >= 2, a(n) = a(n-1) + a(n-2) if a(n-1) < n, otherwise a(n-1) - n.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	5
6	8
7	1
8	9
9	0
10	9
11	9
12	18
13	5
14	23
15	8
16	31
17	14
18	45
19	26
20	6
21	32
22	10
23	42
24	18
25	60
26	34
27	7
28	41
29	12
30	53
31	22
32	75
33	42
34	8
35	50
36	14
37	64
38	26
39	90
40	50
41	9
42	59
43	16
44	75
45	30
46	105
47	58
48	10
49	68
50	18
51	86
52	34
53	120
54	66
55	11
56	77
57	20
58	97
59	38
60	135
61	74
62	12
63	86
64	22
65	108
66	42
67	150

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	5
6	8
7	1
8	9
9	0
10	9
11	9
12	18
13	5
14	23
15	8
16	31
17	14
18	45
19	26
20	6
21	32
22	10
23	42
24	18
25	60
26	34
27	7
28	41
29	12
30	53
31	22
32	75
33	42
34	8
35	50
36	14
37	64
38	26
39	90
40	50
41	9
42	59
43	16
44	75
45	30
46	105
47	58
48	10
49	68
50	18
51	86
52	34
53	120
54	66
55	11
56	77
57	20
58	97
59	38
60	135
61	74
62	12
63	86
64	22
65	108
66	42
67	150

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	5
6	8
7	1
8	9
9	0
10	9
11	9
12	18
13	5
14	23
15	8
16	31
17	14
18	45
19	26
20	6
21	32
22	10
23	42
24	18
25	60
26	34
27	7
28	41
29	12
30	53
31	22
32	75
33	42
34	8
35	50
36	14
37	64
38	26
39	90
40	50
41	9
42	59
43	16
44	75
45	30
46	105
47	58
48	10
49	68
50	18
51	86
52	34
53	120
54	66
55	11
56	77
57	20
58	97
59	38
60	135
61	74
62	12
63	86
64	22
65	108
66	42
67	150