A326404 - cp's OEIS frontend

A326404 Triangle T(n,k) read by rows: T(n,k) = number of ways of seating n people around a table for the second time so that k pairs are maintained. Rotated sequences are counted as one.

n	a(n)
0	1
1	0
2	1
3	0
4	0
5	1
6	0
7	0
8	0
9	2
10	0
11	0
12	4
13	0
14	2
15	2
16	0
17	10
18	10
19	0
20	2
21	6
22	24
23	30
24	40
25	18
26	0
27	2
28	46
29	140
30	224
31	182
32	98
33	28
34	0
35	2
36	354
37	1088
38	1480
39	1280
40	604
41	192
42	40
43	0
44	2
45	3106
46	9000
47	12006
48	9450
49	4878
50	1494
51	330
52	54
53	0
54	2
55	29926
56	83480
57	107170
58	82840
59	41620
60	14152
61	3100
62	520
63	70
64	0
65	2

[1, 0, 1, 0, 0, 1, 0, 0, 0, 2, 0, 0, 4, 0, 2, 2, 0, 10, 10, 0, 2, 6, 24, 30, 40, 18, 0, 2, 46, 140, 224, 182, 98, 28, 0, 2, 354, 1088, 1480, 1280, 604, 192, 40, 0, 2, 3106, 9000, 12006, 9450, 4878, 1494, 330, 54, 0, 2, 29926, 83480, 107170, 82840, 41620, 14152, 3100, 520, 70, 0, 2]

cp's OEIS Frontend

A326404 Triangle T(n,k) read by rows: T(n,k) = number of ways of seating n people around a table for the second time so that k pairs are maintained. Rotated sequences are counted as one.

Table of values

List of values