A219694 - cp's OEIS frontend

A219694 Triangular array read by rows: T(n,k) is the number of functions f:{1,2,...,n} -> {1,2,...,n} that have exactly k nonrecurrent elements; n>=1, 0<=k<=n-1.

n	a(n)
1	1
2	2
3	2
4	6
5	12
6	9
7	24
8	72
9	96
10	64
11	120
12	480
13	900
14	1000
15	625
16	720
17	3600
18	8640
19	12960
20	12960
21	7776
22	5040
23	30240
24	88200
25	164640
26	216090
27	201684
28	117649
29	40320
30	282240
31	967680
32	2150400
33	3440640
34	4128768
35	3670016
36	2097152
37	362880
38	2903040
39	11430720
40	29393280
41	55112400
42	79361856
43	89282088
44	76527504
45	43046721

[1, 2, 2, 6, 12, 9, 24, 72, 96, 64, 120, 480, 900, 1000, 625, 720, 3600, 8640, 12960, 12960, 7776, 5040, 30240, 88200, 164640, 216090, 201684, 117649, 40320, 282240, 967680, 2150400, 3440640, 4128768, 3670016, 2097152, 362880, 2903040, 11430720, 29393280, 55112400, 79361856, 89282088, 76527504, 43046721]

cp's OEIS Frontend

A219694 Triangular array read by rows: T(n,k) is the number of functions f:{1,2,...,n} -> {1,2,...,n} that have exactly k nonrecurrent elements; n>=1, 0<=k<=n-1.

Table of values

List of values