A221876 - cp's OEIS frontend

A221876 T(n,k) is the number of order-preserving full contraction mappings (of an n-chain) with exactly k fixed points.

n	a(n)
1	1
2	2
3	1
4	5
5	2
6	1
7	12
8	5
9	2
10	1
11	28
12	12
13	5
14	2
15	1
16	64
17	28
18	12
19	5
20	2
21	1
22	144
23	64
24	28
25	12
26	5
27	2
28	1
29	320
30	144
31	64
32	28
33	12
34	5
35	2
36	1
37	704
38	320
39	144
40	64
41	28
42	12
43	5
44	2
45	1
46	1536
47	704
48	320
49	144
50	64
51	28
52	12
53	5
54	2
55	1
56	3328
57	1536
58	704
59	320
60	144
61	64
62	28
63	12
64	5
65	2
66	1

[1, 2, 1, 5, 2, 1, 12, 5, 2, 1, 28, 12, 5, 2, 1, 64, 28, 12, 5, 2, 1, 144, 64, 28, 12, 5, 2, 1, 320, 144, 64, 28, 12, 5, 2, 1, 704, 320, 144, 64, 28, 12, 5, 2, 1, 1536, 704, 320, 144, 64, 28, 12, 5, 2, 1, 3328, 1536, 704, 320, 144, 64, 28, 12, 5, 2, 1]

cp's OEIS Frontend

A221876 T(n,k) is the number of order-preserving full contraction mappings (of an n-chain) with exactly k fixed points.

Table of values

List of values