n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 24 |
4 | 192 |
5 | 1920 |
6 | 23040 |
7 | 322560 |
8 | 5160960 |
9 | 92897280 |
10 | 1857945600 |
11 | 40874803200 |
12 | 980995276800 |
13 | 25505877196800 |
14 | 714164561510400 |
15 | 21424936845312000 |
16 | 685597979049984000 |
17 | 23310331287699456000 |
18 | 839171926357180416000 |
19 | 31888533201572855808000 |
20 | 1275541328062914232320000 |
[1,1,4,24,192,1920,23040,322560,5160960,92897280, 1857945600,40874803200,980995276800, 25505877196800,714164561510400,21424936845312000, 685597979049984000,23310331287699456000, 839171926357180416000,31888533201572855808000, 1275541328062914232320000] |