n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 12 |
4 | 48 |
5 | 200 |
6 | 1040 |
7 | 5600 |
8 | 33600 |
9 | 222432 |
10 | 1460928 |
11 | 11487168 |
12 | 84713728 |
13 | 731574272 |
14 | 6314147840 |
15 | 55456727040 |
16 | 548291597568 |
17 | 5226494727168 |
18 | 54361802626560 |
19 | 586042688924160 |
20 | 6149776714099200 |
21 | 72895623466265600 |
22 | 855187250563024896 |
[1,2,4,12,48,200,1040,5600,33600,222432,1460928, 11487168,84713728,731574272,6314147840, 55456727040,548291597568,5226494727168, 54361802626560,586042688924160,6149776714099200, 72895623466265600,855187250563024896] |