n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 24 |
4 | 192 |
5 | 1280 |
6 | 7680 |
7 | 48384 |
8 | 315392 |
9 | 1916928 |
10 | 11182080 |
11 | 72089600 |
12 | 441188352 |
13 | 2589982720 |
14 | 15863644160 |
15 | 97493975040 |
16 | 578813952000 |
17 | 3411143557120 |
18 | 21023026053120 |
19 | 125795699785728 |
20 | 733623363829760 |
21 | 4459657816965120 |
22 | 26839963597275136 |
23 | 157885776644800512 |
[1,4,24,192,1280,7680,48384,315392,1916928, 11182080,72089600,441188352,2589982720, 15863644160,97493975040,578813952000, 3411143557120,21023026053120,125795699785728, 733623363829760,4459657816965120, 26839963597275136,157885776644800512] |