A245405 - cp's OEIS frontend

A245405 Number A(n,k) of endofunctions on [n] such that no element has a preimage of cardinality k; square array A(n,k), n>=0, k>=0, read by antidiagonals.

n	a(n)
0	1
1	1
2	1
3	1
4	0
5	2
6	1
7	1
8	2
9	6
10	1
11	1
12	2
13	3
14	24
15	1
16	1
17	4
18	9
19	40
20	120
21	1
22	1
23	4
24	24
25	76
26	205
27	720
28	1
29	1
30	4
31	27
32	208
33	825
34	2556
35	5040
36	1
37	1
38	4
39	27
40	252
41	2325
42	10206
43	24409
44	40320
45	1
46	1
47	4
48	27
49	256
50	3025
51	31956
52	143521
53	347712
54	362880
55	1
56	1
57	4
58	27
59	256
60	3120
61	44406
62	520723
63	2313200
64	4794633
65	3628800

[1, 1, 1, 1, 0, 2, 1, 1, 2, 6, 1, 1, 2, 3, 24, 1, 1, 4, 9, 40, 120, 1, 1, 4, 24, 76, 205, 720, 1, 1, 4, 27, 208, 825, 2556, 5040, 1, 1, 4, 27, 252, 2325, 10206, 24409, 40320, 1, 1, 4, 27, 256, 3025, 31956, 143521, 347712, 362880, 1, 1, 4, 27, 256, 3120, 44406, 520723, 2313200, 4794633, 3628800]

cp's OEIS Frontend

A245405 Number A(n,k) of endofunctions on [n] such that no element has a preimage of cardinality k; square array A(n,k), n>=0, k>=0, read by antidiagonals.

Table of values

List of values