n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 6 |
5 | 7 |
6 | 24 |
7 | 120 |
8 | 9 |
9 | 40320 |
10 | 11 |
11 | 3628800 |
12 | 13 |
13 | 479001600 |
14 | 15 |
15 | 87178291200 |
16 | 17 |
17 | 20922789888000 |
18 | 19 |
19 | 6402373705728000 |
20 | 21 |
21 | 2432902008176640000 |
22 | 23 |
23 | 1124000727777607680000 |
24 | 720 |
25 | 26 |
26 | 15511210043330985984000000 |
27 | 28 |
[1,1,2,4,6,7,24,120,9,40320,11,3628800,13, 479001600,15,87178291200,17,20922789888000,19, 6402373705728000,21,2432902008176640000,23, 1124000727777607680000,720,26, 15511210043330985984000000,28] |