A231536 - cp's OEIS frontend

A231536 Triangular array read by rows. T(n,k) is the number of functions f:{1,2,...,n}->{1,2,...,n} whose functional digraph has exactly k nodes such that no nonrecurrent element is mapped into it. n >= 1, 1 <= k <= n.

n	a(n)
1	1
2	2
3	2
4	6
5	15
6	6
7	24
8	108
9	100
10	24
11	120
12	840
13	1340
14	705
15	120
16	720
17	7200
18	17400
19	15150
20	5466
21	720
22	5040
23	68040
24	231000
25	296100
26	171402
27	46921
28	5040
29	40320
30	705600
31	3198720
32	5644800
33	4687536
34	2015272
35	444648
36	40320
37	362880
38	7983360
39	46569600
40	108168480
41	121144464
42	73191888
43	25011576
44	4625361
45	362880

[1, 2, 2, 6, 15, 6, 24, 108, 100, 24, 120, 840, 1340, 705, 120, 720, 7200, 17400, 15150, 5466, 720, 5040, 68040, 231000, 296100, 171402, 46921, 5040, 40320, 705600, 3198720, 5644800, 4687536, 2015272, 444648, 40320, 362880, 7983360, 46569600, 108168480, 121144464, 73191888, 25011576, 4625361, 362880]

cp's OEIS Frontend

A231536 Triangular array read by rows. T(n,k) is the number of functions f:{1,2,...,n}->{1,2,...,n} whose functional digraph has exactly k nodes such that no nonrecurrent element is mapped into it. n >= 1, 1 <= k <= n.

Table of values

List of values