A221878 - cp's OEIS frontend

A221878 Number of order-preserving or order-reversing full contraction mappings (of an n-chain) with exactly k fixed points.

n	a(n)
1	1
2	0
3	1
4	1
5	2
6	1
7	2
8	8
9	2
10	1
11	6
12	22
13	5
14	2
15	1
16	14
17	57
18	12
19	5
20	2
21	1
22	34
23	136
24	28
25	12
26	5
27	2
28	1
29	78
30	315
31	64
32	28
33	12
34	5
35	2
36	1
37	178
38	710
39	144
40	64
41	28
42	12
43	5
44	2
45	1
46	398
47	1577
48	320
49	144
50	64
51	28
52	12
53	5
54	2
55	1
56	882
57	3460
58	704
59	320
60	144
61	64
62	28
63	12
64	5
65	2
66	1

[1, 0, 1, 1, 2, 1, 2, 8, 2, 1, 6, 22, 5, 2, 1, 14, 57, 12, 5, 2, 1, 34, 136, 28, 12, 5, 2, 1, 78, 315, 64, 28, 12, 5, 2, 1, 178, 710, 144, 64, 28, 12, 5, 2, 1, 398, 1577, 320, 144, 64, 28, 12, 5, 2, 1, 882, 3460, 704, 320, 144, 64, 28, 12, 5, 2, 1]

cp's OEIS Frontend

A221878 Number of order-preserving or order-reversing full contraction mappings (of an n-chain) with exactly k fixed points.

Table of values

List of values