A245348 - cp's OEIS frontend

A245348 Number T(n,k) of endofunctions f on [n] that are self-inverse on [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

n	a(n)
0	1
1	1
2	1
3	4
4	3
5	2
6	27
7	15
8	8
9	4
10	256
11	112
12	50
13	22
14	10
15	3125
16	1125
17	430
18	166
19	66
20	26
21	46656
22	14256
23	4752
24	1626
25	576
26	206
27	76
28	823543
29	218491
30	64484
31	19768
32	6310
33	2054
34	688
35	232
36	16777216
37	3932160
38	1040384
39	288512
40	83736
41	24952
42	7660
43	2388
44	764

[1, 1, 1, 4, 3, 2, 27, 15, 8, 4, 256, 112, 50, 22, 10, 3125, 1125, 430, 166, 66, 26, 46656, 14256, 4752, 1626, 576, 206, 76, 823543, 218491, 64484, 19768, 6310, 2054, 688, 232, 16777216, 3932160, 1040384, 288512, 83736, 24952, 7660, 2388, 764]

cp's OEIS Frontend

A245348 Number T(n,k) of endofunctions f on [n] that are self-inverse on [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

List of values