A001338 - cp's OEIS frontend

A001338 -1 + Sum (k-1)! C(n,k), k = 1..n for n > 0, a(0) = 1.

n	a(n)
0	1
1	0
2	2
3	7
4	23
5	88
6	414
7	2371
8	16071
9	125672
10	1112082
11	10976183
12	119481295
13	1421542640
14	18348340126
15	255323504931
16	3809950977007
17	60683990530224
18	1027542662934914
19	18430998766219335
20	349096664728623335
21	6962409983976703336
22	145841989688186383358

[1, 0, 2, 7, 23, 88, 414, 2371, 16071, 125672, 1112082, 10976183, 119481295, 1421542640, 18348340126, 255323504931, 3809950977007, 60683990530224, 1027542662934914, 18430998766219335, 349096664728623335, 6962409983976703336, 145841989688186383358]

cp's OEIS Frontend

A001338 -1 + Sum (k-1)! C(n,k), k = 1..n for n > 0, a(0) = 1.

Table of values

List of values