A226283 - cp's OEIS frontend

A226283 a(n) = [n/2]![(n+1)/2]!C([n/2],2)*C([(n+1)/2],2).

n	a(n)
1	0
2	0
3	0
4	4
5	36
6	324
7	2592
8	20736
9	172800
10	1440000
11	12960000
12	116640000
13	1143072000
14	11202105600
15	119489126400
16	1274550681600
17	14748372172800
18	170659735142400
19	2133246689280000
20	26665583616000000
21	358503957504000000
22	4819886539776000000
23	69406366172774400000

[0, 0, 0, 4, 36, 324, 2592, 20736, 172800, 1440000, 12960000, 116640000, 1143072000, 11202105600, 119489126400, 1274550681600, 14748372172800, 170659735142400, 2133246689280000, 26665583616000000, 358503957504000000, 4819886539776000000, 69406366172774400000]

cp's OEIS Frontend

A226283 a(n) = [n/2]![(n+1)/2]!C([n/2],2)*C([(n+1)/2],2).

Table of values

List of values

cp's OEIS Frontend

A226283 a(n) = [n/2]!*[(n+1)/2]!*C([n/2],2)*C([(n+1)/2],2).

Table of values

List of values

A226283 a(n) = [n/2]![(n+1)/2]!C([n/2],2)*C([(n+1)/2],2).