A358791 - cp's OEIS frontend

A358791 a(n) = n!Sum_{m=0..floor(n/2)} binomial(n,2m)^(-1).

n	a(n)
0	1
1	1
2	4
3	8
4	52
5	156
6	1536
7	6144
8	84096
9	420480
10	7453440
11	44720640
12	974972160
13	6824805120
14	176504832000
15	1412038656000
16	42224136192000
17	380017225728000
18	12893605517721600
19	128936055177216000
20	4892595136708608000

[1, 1, 4, 8, 52, 156, 1536, 6144, 84096, 420480, 7453440, 44720640, 974972160, 6824805120, 176504832000, 1412038656000, 42224136192000, 380017225728000, 12893605517721600, 128936055177216000, 4892595136708608000]

cp's OEIS Frontend

A358791 a(n) = n!Sum_{m=0..floor(n/2)} binomial(n,2m)^(-1).

Table of values

List of values

cp's OEIS Frontend

A358791 a(n) = n!*Sum_{m=0..floor(n/2)} binomial(n,2*m)^(-1).

Table of values

List of values

A358791 a(n) = n!Sum_{m=0..floor(n/2)} binomial(n,2m)^(-1).