A318712 - cp's OEIS frontend

A318712 Numbers k for which a riffle shuffle permutation with two or more packets permutes all except the first and the last of the k cards.

n	a(n)
1	4
2	6
3	12
4	14
5	18
6	20
7	30
8	38
9	42
10	54
11	60
12	62
13	68
14	84
15	90
16	98
17	102
18	108
19	110
20	114
21	132
22	138
23	140
24	150
25	164
26	174
27	180
28	182
29	198
30	212
31	228
32	230
33	234
34	252
35	258
36	270
37	282
38	294
39	308
40	318
41	348
42	350
43	354
44	374
45	380
46	390
47	402
48	420
49	422
50	434
51	444
52	450
53	462
54	468
55	492
56	500
57	510
58	522
59	524
60	542
61	548
62	558
63	564

[4, 6, 12, 14, 18, 20, 30, 38, 42, 54, 60, 62, 68, 84, 90, 98, 102, 108, 110, 114, 132, 138, 140, 150, 164, 174, 180, 182, 198, 212, 228, 230, 234, 252, 258, 270, 282, 294, 308, 318, 348, 350, 354, 374, 380, 390, 402, 420, 422, 434, 444, 450, 462, 468, 492, 500, 510, 522, 524, 542, 548, 558, 564]

cp's OEIS Frontend

A318712 Numbers k for which a riffle shuffle permutation with two or more packets permutes all except the first and the last of the k cards.

Table of values

List of values

n	a(n)
1	4
2	6
3	12
4	14
5	18
6	20
7	30
8	38
9	42
10	54
11	60
12	62
13	68
14	84
15	90
16	98
17	102
18	108
19	110
20	114
21	132
22	138
23	140
24	150
25	164
26	174
27	180
28	182
29	198
30	212
31	228
32	230
33	234
34	252
35	258
36	270
37	282
38	294
39	308
40	318
41	348
42	350
43	354
44	374
45	380
46	390
47	402
48	420
49	422
50	434
51	444
52	450
53	462
54	468
55	492
56	500
57	510
58	522
59	524
60	542
61	548
62	558
63	564

n	a(n)
1	4
2	6
3	12
4	14
5	18
6	20
7	30
8	38
9	42
10	54
11	60
12	62
13	68
14	84
15	90
16	98
17	102
18	108
19	110
20	114
21	132
22	138
23	140
24	150
25	164
26	174
27	180
28	182
29	198
30	212
31	228
32	230
33	234
34	252
35	258
36	270
37	282
38	294
39	308
40	318
41	348
42	350
43	354
44	374
45	380
46	390
47	402
48	420
49	422
50	434
51	444
52	450
53	462
54	468
55	492
56	500
57	510
58	522
59	524
60	542
61	548
62	558
63	564

n	a(n)
1	4
2	6
3	12
4	14
5	18
6	20
7	30
8	38
9	42
10	54
11	60
12	62
13	68
14	84
15	90
16	98
17	102
18	108
19	110
20	114
21	132
22	138
23	140
24	150
25	164
26	174
27	180
28	182
29	198
30	212
31	228
32	230
33	234
34	252
35	258
36	270
37	282
38	294
39	308
40	318
41	348
42	350
43	354
44	374
45	380
46	390
47	402
48	420
49	422
50	434
51	444
52	450
53	462
54	468
55	492
56	500
57	510
58	522
59	524
60	542
61	548
62	558
63	564