A133709 - cp's OEIS frontend

A133709 Triangle read by rows: T(m,l) = number of labeled covers of size l of a finite set of m unlabeled elements (m >= 1, 1 <= l <= 2^m - 1).

n	a(n)
1	1
2	1
3	3
4	3
5	1
6	7
7	35
8	140
9	420
10	840
11	840
12	1
13	12
14	131
15	1435
16	15225
17	150570
18	1351770
19	10810800
20	75675600
21	454053600
22	2270268000
23	9081072000
24	27243216000
25	54486432000
26	54486432000
27	1
28	18
29	347
30	7693
31	185031
32	4568046
33	111793710
34	2661422400

[1, 1, 3, 3, 1, 7, 35, 140, 420, 840, 840, 1, 12, 131, 1435, 15225, 150570, 1351770, 10810800, 75675600, 454053600, 2270268000, 9081072000, 27243216000, 54486432000, 54486432000, 1, 18, 347, 7693, 185031, 4568046, 111793710, 2661422400]

cp's OEIS Frontend

A133709 Triangle read by rows: T(m,l) = number of labeled covers of size l of a finite set of m unlabeled elements (m >= 1, 1 <= l <= 2^m - 1).

Table of values

List of values