A358491 - cp's OEIS frontend

A358491 a(n) = n!*Sum_{m=0..floor((n-1)/2)} 1/(n-m)/binomial(n-m-1,m).

n	a(n)
1	1
2	1
3	5
4	10
5	74
6	216
7	2316
8	8688
9	128880
10	581760
11	11406240
12	59667840
13	1482693120
14	8782905600
15	266800262400
16	1762116249600
17	63536485017600
18	462613126348800
19	19342202181120000
20	153884245616640000
21	7325057766297600000

[1, 1, 5, 10, 74, 216, 2316, 8688, 128880, 581760, 11406240, 59667840, 1482693120, 8782905600, 266800262400, 1762116249600, 63536485017600, 462613126348800, 19342202181120000, 153884245616640000, 7325057766297600000]

cp's OEIS Frontend

A358491 a(n) = n!*Sum_{m=0..floor((n-1)/2)} 1/(n-m)/binomial(n-m-1,m).

Table of values

List of values