n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 10 |
4 | 48 |
5 | 260 |
6 | 1630 |
7 | 11742 |
8 | 95900 |
9 | 876808 |
10 | 8877690 |
11 | 98641010 |
12 | 1193556232 |
13 | 15624736140 |
14 | 220048367318 |
15 | 3317652307270 |
16 | 53319412081140 |
17 | 909984632851472 |
18 | 16436597430879730 |
19 | 313262209859119578 |
20 | 6282647653285676000 |
21 | 132266266384961600020 |
22 | 2916471173788403280462 |
[0,2,10,48,260,1630,11742,95900,876808,8877690, 98641010,1193556232,15624736140,220048367318, 3317652307270,53319412081140,909984632851472, 16436597430879730,313262209859119578, 6282647653285676000,132266266384961600020, 2916471173788403280462] |