A381055 - cp's OEIS frontend

A381055 a(n) = -n/2 if n is even, 3n + 1 if n is odd.

n	a(n)
0	0
1	4
2	-1
3	10
4	-2
5	16
6	-3
7	22
8	-4
9	28
10	-5
11	34
12	-6
13	40
14	-7
15	46
16	-8
17	52
18	-9
19	58
20	-10
21	64
22	-11
23	70
24	-12
25	76
26	-13
27	82
28	-14
29	88
30	-15
31	94
32	-16
33	100
34	-17
35	106
36	-18
37	112
38	-19
39	118
40	-20
41	124
42	-21
43	130
44	-22
45	136
46	-23
47	142
48	-24
49	148
50	-25
51	154
52	-26
53	160
54	-27
55	166
56	-28
57	172

[0, 4, -1, 10, -2, 16, -3, 22, -4, 28, -5, 34, -6, 40, -7, 46, -8, 52, -9, 58, -10, 64, -11, 70, -12, 76, -13, 82, -14, 88, -15, 94, -16, 100, -17, 106, -18, 112, -19, 118, -20, 124, -21, 130, -22, 136, -23, 142, -24, 148, -25, 154, -26, 160, -27, 166, -28, 172]

cp's OEIS Frontend

A381055 a(n) = -n/2 if n is even, 3n + 1 if n is odd.

Table of values

List of values

n	a(n)
0	0
1	4
2	-1
3	10
4	-2
5	16
6	-3
7	22
8	-4
9	28
10	-5
11	34
12	-6
13	40
14	-7
15	46
16	-8
17	52
18	-9
19	58
20	-10
21	64
22	-11
23	70
24	-12
25	76
26	-13
27	82
28	-14
29	88
30	-15
31	94
32	-16
33	100
34	-17
35	106
36	-18
37	112
38	-19
39	118
40	-20
41	124
42	-21
43	130
44	-22
45	136
46	-23
47	142
48	-24
49	148
50	-25
51	154
52	-26
53	160
54	-27
55	166
56	-28
57	172

n	a(n)
0	0
1	4
2	-1
3	10
4	-2
5	16
6	-3
7	22
8	-4
9	28
10	-5
11	34
12	-6
13	40
14	-7
15	46
16	-8
17	52
18	-9
19	58
20	-10
21	64
22	-11
23	70
24	-12
25	76
26	-13
27	82
28	-14
29	88
30	-15
31	94
32	-16
33	100
34	-17
35	106
36	-18
37	112
38	-19
39	118
40	-20
41	124
42	-21
43	130
44	-22
45	136
46	-23
47	142
48	-24
49	148
50	-25
51	154
52	-26
53	160
54	-27
55	166
56	-28
57	172

n	a(n)
0	0
1	4
2	-1
3	10
4	-2
5	16
6	-3
7	22
8	-4
9	28
10	-5
11	34
12	-6
13	40
14	-7
15	46
16	-8
17	52
18	-9
19	58
20	-10
21	64
22	-11
23	70
24	-12
25	76
26	-13
27	82
28	-14
29	88
30	-15
31	94
32	-16
33	100
34	-17
35	106
36	-18
37	112
38	-19
39	118
40	-20
41	124
42	-21
43	130
44	-22
45	136
46	-23
47	142
48	-24
49	148
50	-25
51	154
52	-26
53	160
54	-27
55	166
56	-28
57	172