A051732 - cp's OEIS frontend

A051732 Number of rounds of shuffling required to restore a deck of n cards to its original order: shuffling is done by keeping first card, putting second at end of deck, keeping next, putting next at end and so on.

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	5
7	6
8	6
9	4
10	9
11	4
12	28
13	10
14	9
15	14
16	12
17	5
18	70
19	18
20	24
21	10
22	7
23	210
24	126
25	110
26	60
27	26
28	120
29	9
30	29
31	30
32	60
33	6
34	33
35	308
36	42
37	60
38	990
39	30
40	374
41	27
42	41
43	60
44	2618
45	840
46	840
47	420
48	1386
49	24
50	15
51	50
52	644
53	840
54	53
55	18
56	1386
57	14
58	13300
59	2520
60	1260
61	55
62	6930
63	50
64	60
65	7

[1, 1, 2, 2, 3, 5, 6, 6, 4, 9, 4, 28, 10, 9, 14, 12, 5, 70, 18, 24, 10, 7, 210, 126, 110, 60, 26, 120, 9, 29, 30, 60, 6, 33, 308, 42, 60, 990, 30, 374, 27, 41, 60, 2618, 840, 840, 420, 1386, 24, 15, 50, 644, 840, 53, 18, 1386, 14, 13300, 2520, 1260, 55, 6930, 50, 60, 7]

cp's OEIS Frontend

A051732 Number of rounds of shuffling required to restore a deck of n cards to its original order: shuffling is done by keeping first card, putting second at end of deck, keeping next, putting next at end and so on.

Table of values

List of values