A246552 - cp's OEIS frontend

A246552 2-adic valuation of the number of involutions of n (A000085).

n	a(n)
0	0
1	0
2	1
3	2
4	1
5	1
6	2
7	3
8	2
9	2
10	3
11	4
12	3
13	3
14	4
15	5
16	4
17	4
18	5
19	6
20	5
21	5
22	6
23	7
24	6
25	6
26	7
27	8
28	7
29	7
30	8
31	9
32	8
33	8
34	9
35	10
36	9
37	9
38	10
39	11
40	10
41	10
42	11
43	12
44	11
45	11
46	12
47	13
48	12
49	12
50	13
51	14
52	13
53	13
54	14
55	15
56	14
57	14
58	15
59	16
60	15
61	15
62	16
63	17
64	16
65	16
66	17
67	18
68	17
69	17
70	18
71	19
72	18
73	18
74	19
75	20
76	19
77	19
78	20
79	21
80	20
81	20
82	21
83	22
84	21
85	21
86	22
87	23
88	22
89	22
90	23

[0, 0, 1, 2, 1, 1, 2, 3, 2, 2, 3, 4, 3, 3, 4, 5, 4, 4, 5, 6, 5, 5, 6, 7, 6, 6, 7, 8, 7, 7, 8, 9, 8, 8, 9, 10, 9, 9, 10, 11, 10, 10, 11, 12, 11, 11, 12, 13, 12, 12, 13, 14, 13, 13, 14, 15, 14, 14, 15, 16, 15, 15, 16, 17, 16, 16, 17, 18, 17, 17, 18, 19, 18, 18, 19, 20, 19, 19, 20, 21, 20, 20, 21, 22, 21, 21, 22, 23, 22, 22, 23]

cp's OEIS Frontend

A246552 2-adic valuation of the number of involutions of n (A000085).

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	2
4	1
5	1
6	2
7	3
8	2
9	2
10	3
11	4
12	3
13	3
14	4
15	5
16	4
17	4
18	5
19	6
20	5
21	5
22	6
23	7
24	6
25	6
26	7
27	8
28	7
29	7
30	8
31	9
32	8
33	8
34	9
35	10
36	9
37	9
38	10
39	11
40	10
41	10
42	11
43	12
44	11
45	11
46	12
47	13
48	12
49	12
50	13
51	14
52	13
53	13
54	14
55	15
56	14
57	14
58	15
59	16
60	15
61	15
62	16
63	17
64	16
65	16
66	17
67	18
68	17
69	17
70	18
71	19
72	18
73	18
74	19
75	20
76	19
77	19
78	20
79	21
80	20
81	20
82	21
83	22
84	21
85	21
86	22
87	23
88	22
89	22
90	23

n	a(n)
0	0
1	0
2	1
3	2
4	1
5	1
6	2
7	3
8	2
9	2
10	3
11	4
12	3
13	3
14	4
15	5
16	4
17	4
18	5
19	6
20	5
21	5
22	6
23	7
24	6
25	6
26	7
27	8
28	7
29	7
30	8
31	9
32	8
33	8
34	9
35	10
36	9
37	9
38	10
39	11
40	10
41	10
42	11
43	12
44	11
45	11
46	12
47	13
48	12
49	12
50	13
51	14
52	13
53	13
54	14
55	15
56	14
57	14
58	15
59	16
60	15
61	15
62	16
63	17
64	16
65	16
66	17
67	18
68	17
69	17
70	18
71	19
72	18
73	18
74	19
75	20
76	19
77	19
78	20
79	21
80	20
81	20
82	21
83	22
84	21
85	21
86	22
87	23
88	22
89	22
90	23

n	a(n)
0	0
1	0
2	1
3	2
4	1
5	1
6	2
7	3
8	2
9	2
10	3
11	4
12	3
13	3
14	4
15	5
16	4
17	4
18	5
19	6
20	5
21	5
22	6
23	7
24	6
25	6
26	7
27	8
28	7
29	7
30	8
31	9
32	8
33	8
34	9
35	10
36	9
37	9
38	10
39	11
40	10
41	10
42	11
43	12
44	11
45	11
46	12
47	13
48	12
49	12
50	13
51	14
52	13
53	13
54	14
55	15
56	14
57	14
58	15
59	16
60	15
61	15
62	16
63	17
64	16
65	16
66	17
67	18
68	17
69	17
70	18
71	19
72	18
73	18
74	19
75	20
76	19
77	19
78	20
79	21
80	20
81	20
82	21
83	22
84	21
85	21
86	22
87	23
88	22
89	22
90	23