A259759 - cp's OEIS frontend

A259759 Triangle read by rows: T(n,k) = number of partial idempotent mappings (of an n-chain) with collapse exactly k.

n	a(n)
0	1
1	2
2	0
3	4
4	0
5	2
6	8
7	0
8	12
9	3
10	16
11	0
12	48
13	24
14	16
15	32
16	0
17	160
18	120
19	160
20	65
21	64
22	0
23	480
24	480
25	960
26	780
27	336
28	128
29	0
30	1344
31	1680
32	4480
33	5460
34	4704
35	1897
36	256
37	0
38	3584
39	5376
40	17920
41	29120
42	37632
43	30352
44	11824
45	512
46	0
47	9216
48	16128
49	64512
50	131040
51	225792
52	273168
53	212832
54	80145

[1, 2, 0, 4, 0, 2, 8, 0, 12, 3, 16, 0, 48, 24, 16, 32, 0, 160, 120, 160, 65, 64, 0, 480, 480, 960, 780, 336, 128, 0, 1344, 1680, 4480, 5460, 4704, 1897, 256, 0, 3584, 5376, 17920, 29120, 37632, 30352, 11824, 512, 0, 9216, 16128, 64512, 131040, 225792, 273168, 212832, 80145]

cp's OEIS Frontend

A259759 Triangle read by rows: T(n,k) = number of partial idempotent mappings (of an n-chain) with collapse exactly k.

Table of values

List of values