A245693 - cp's OEIS frontend

A245693 Number T(n,k) of permutations on [n] that are self-inverse on [k] but not on [k+1]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

n	a(n)
0	1
1	0
2	1
3	0
4	0
5	2
6	2
7	0
8	0
9	4
10	12
11	2
12	0
13	0
14	10
15	72
16	18
17	4
18	0
19	0
20	26
21	480
22	120
23	36
24	8
25	0
26	0
27	76
28	3600
29	840
30	264
31	84
32	20
33	0
34	0
35	232
36	30240
37	6480
38	1920
39	648
40	216
41	52
42	0
43	0
44	764
45	282240
46	55440
47	15120
48	4920
49	1776
50	612
51	152
52	0
53	0
54	2620
55	2903040
56	524160
57	131040
58	39600
59	13920
60	5232
61	1848
62	464
63	0
64	0
65	9496

[1, 0, 1, 0, 0, 2, 2, 0, 0, 4, 12, 2, 0, 0, 10, 72, 18, 4, 0, 0, 26, 480, 120, 36, 8, 0, 0, 76, 3600, 840, 264, 84, 20, 0, 0, 232, 30240, 6480, 1920, 648, 216, 52, 0, 0, 764, 282240, 55440, 15120, 4920, 1776, 612, 152, 0, 0, 2620, 2903040, 524160, 131040, 39600, 13920, 5232, 1848, 464, 0, 0, 9496]

cp's OEIS Frontend

A245693 Number T(n,k) of permutations on [n] that are self-inverse on [k] but not on [k+1]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

List of values