A224497 - cp's OEIS frontend

A224497 a(n) = sqrt(floor(n/2)! * Product_{k=1..n} Product_{i=1..k-1} gcd(k,i)).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	12
7	12
8	96
9	288
10	5760
11	5760
12	829440
13	829440
14	46448640
15	2090188800
16	267544166400
17	267544166400
18	346737239654400
19	346737239654400
20	1109559166894080000
21	209706682542981120000
22	73816752255129354240000
23	73816752255129354240000

[1, 1, 1, 1, 2, 2, 12, 12, 96, 288, 5760, 5760, 829440, 829440, 46448640, 2090188800, 267544166400, 267544166400, 346737239654400, 346737239654400, 1109559166894080000, 209706682542981120000, 73816752255129354240000, 73816752255129354240000]

cp's OEIS Frontend

A224497 a(n) = sqrt(floor(n/2)! * Product_{k=1..n} Product_{i=1..k-1} gcd(k,i)).

Table of values

List of values