A231915 - cp's OEIS frontend

A231915 Number T(n,k) of endofunctions on [n] such that at most k elements with nonempty preimage have equal preimage cardinality and non-equinumerous preimages have cardinalities that differ by at least k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

n	a(n)
0	1
1	0
2	1
3	0
4	2
5	4
6	0
7	21
8	3
9	9
10	0
11	52
12	88
13	40
14	64
15	0
16	305
17	705
18	105
19	5
20	125
21	0
22	7836
23	2736
24	4086
25	2286
26	2106
27	2826
28	0
29	24703
30	20293
31	34993
32	4711
33	301
34	7
35	5047
36	0
37	155688
38	557488
39	107472
40	283872
41	188224
42	178816
43	178368
44	218688

[1, 0, 1, 0, 2, 4, 0, 21, 3, 9, 0, 52, 88, 40, 64, 0, 305, 705, 105, 5, 125, 0, 7836, 2736, 4086, 2286, 2106, 2826, 0, 24703, 20293, 34993, 4711, 301, 7, 5047, 0, 155688, 557488, 107472, 283872, 188224, 178816, 178368, 218688]

cp's OEIS Frontend

A231915 Number T(n,k) of endofunctions on [n] such that at most k elements with nonempty preimage have equal preimage cardinality and non-equinumerous preimages have cardinalities that differ by at least k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

List of values