A268219 - cp's OEIS frontend

A268219 a(n) = (n!/4!)*Sum(1/k!,k=1..n-4).

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	5
6	45
7	350
8	2870
9	25956
10	259770
11	2857800
12	34294095
13	445823950
14	6241536301
15	93623045880
16	1497968735900
17	25465468512680
18	458378433231300
19	8709190231398576
20	174183804627976365
21	3657859897187509650
22	80472917738125219615
23	1850877107976880060000
24	44421050591445121450626

[0, 0, 0, 0, 0, 5, 45, 350, 2870, 25956, 259770, 2857800, 34294095, 445823950, 6241536301, 93623045880, 1497968735900, 25465468512680, 458378433231300, 8709190231398576, 174183804627976365, 3657859897187509650, 80472917738125219615, 1850877107976880060000, 44421050591445121450626]

cp's OEIS Frontend

A268219 a(n) = (n!/4!)*Sum(1/k!,k=1..n-4).

Table of values

List of values