A326397 - cp's OEIS frontend

A326397 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. Reflected 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	3
10	0
11	0
12	8
13	0
14	4
15	5
16	0
17	25
18	25
19	0
20	5
21	18
22	72
23	90
24	120
25	54
26	0
27	6
28	161
29	490
30	784
31	637
32	343
33	98
34	0
35	7
36	1416
37	4352
38	5920
39	5120
40	2416
41	768
42	160
43	0
44	8
45	13977
46	40500
47	54027
48	42525
49	21951
50	6723
51	1485
52	243
53	0
54	9
55	149630
56	417400
57	535850
58	414200
59	208100
60	70760
61	15500
62	2600
63	350
64	0
65	10
66	1737241
67	4691654

[1, 0, 1, 0, 0, 1, 0, 0, 0, 3, 0, 0, 8, 0, 4, 5, 0, 25, 25, 0, 5, 18, 72, 90, 120, 54, 0, 6, 161, 490, 784, 637, 343, 98, 0, 7, 1416, 4352, 5920, 5120, 2416, 768, 160, 0, 8, 13977, 40500, 54027, 42525, 21951, 6723, 1485, 243, 0, 9, 149630, 417400, 535850, 414200, 208100, 70760, 15500, 2600, 350, 0, 10, 1737241, 4691654]

cp's OEIS Frontend

A326397 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. Reflected sequences are counted as one.

Table of values

List of values