A100861 - cp's OEIS frontend

A100861 Triangle of Bessel numbers read by rows: T(n,k) is the number of k-matchings of the complete graph K(n).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	3
6	1
7	6
8	3
9	1
10	10
11	15
12	1
13	15
14	45
15	15
16	1
17	21
18	105
19	105
20	1
21	28
22	210
23	420
24	105
25	1
26	36
27	378
28	1260
29	945
30	1
31	45
32	630
33	3150
34	4725
35	945
36	1
37	55
38	990
39	6930
40	17325
41	10395
42	1
43	66
44	1485
45	13860
46	51975
47	62370
48	10395
49	1
50	78
51	2145
52	25740
53	135135
54	270270
55	135135
56	1
57	91
58	3003
59	45045
60	315315
61	945945
62	945945
63	135135

[1, 1, 1, 1, 1, 3, 1, 6, 3, 1, 10, 15, 1, 15, 45, 15, 1, 21, 105, 105, 1, 28, 210, 420, 105, 1, 36, 378, 1260, 945, 1, 45, 630, 3150, 4725, 945, 1, 55, 990, 6930, 17325, 10395, 1, 66, 1485, 13860, 51975, 62370, 10395, 1, 78, 2145, 25740, 135135, 270270, 135135, 1, 91, 3003, 45045, 315315, 945945, 945945, 135135]

cp's OEIS Frontend

A100861 Triangle of Bessel numbers read by rows: T(n,k) is the number of k-matchings of the complete graph K(n).

Table of values

List of values