A174551 - cp's OEIS frontend

A174551 Triangular array T(n,k): functions f:{1,2,...,n}-> {1,2,...,n} such that each of k fixed (but arbitrary) elements are in the image of f.

n	a(n)
0	1
1	1
2	1
3	4
4	3
5	2
6	27
7	19
8	12
9	6
10	256
11	175
12	110
13	60
14	24
15	3125
16	2101
17	1320
18	750
19	360
20	120
21	46656
22	31031
23	19502
24	11340
25	5880
26	2520
27	720
28	823543
29	543607
30	341796
31	201726
32	109200
33	52080
34	20160
35	5040
36	16777216
37	11012415
38	6927230
39	4131036
40	2298744
41	1164240
42	514080
43	181440
44	40320

[1, 1, 1, 4, 3, 2, 27, 19, 12, 6, 256, 175, 110, 60, 24, 3125, 2101, 1320, 750, 360, 120, 46656, 31031, 19502, 11340, 5880, 2520, 720, 823543, 543607, 341796, 201726, 109200, 52080, 20160, 5040, 16777216, 11012415, 6927230, 4131036, 2298744, 1164240, 514080, 181440, 40320]

cp's OEIS Frontend

A174551 Triangular array T(n,k): functions f:{1,2,...,n}-> {1,2,...,n} such that each of k fixed (but arbitrary) elements are in the image of f.

Table of values

List of values