A000522 - cp's OEIS frontend

A000522 Total number of ordered k-tuples (k=0..n) of distinct elements from an n-element set: a(n) = Sum_{k=0..n} n!/k!.

n	a(n)
0	1
1	2
2	5
3	16
4	65
5	326
6	1957
7	13700
8	109601
9	986410
10	9864101
11	108505112
12	1302061345
13	16926797486
14	236975164805
15	3554627472076
16	56874039553217
17	966858672404690
18	17403456103284421
19	330665665962404000
20	6613313319248080001
21	138879579704209680022
22	3055350753492612960485
23	70273067330330098091156

[1, 2, 5, 16, 65, 326, 1957, 13700, 109601, 986410, 9864101, 108505112, 1302061345, 16926797486, 236975164805, 3554627472076, 56874039553217, 966858672404690, 17403456103284421, 330665665962404000, 6613313319248080001, 138879579704209680022, 3055350753492612960485, 70273067330330098091156]

cp's OEIS Frontend

A000522 Total number of ordered k-tuples (k=0..n) of distinct elements from an n-element set: a(n) = Sum_{k=0..n} n!/k!.

Table of values

List of values