n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 21 |
6 | 126 |
7 | 1023 |
8 | 8240 |
9 | 84745 |
10 | 869410 |
11 | 10925883 |
12 | 134232088 |
13 | 1994183205 |
14 | 29004251836 |
15 | 490209014571 |
16 | 8250288250240 |
17 | 158096182329585 |
18 | 2993242910107914 |
19 | 64115697136312563 |
[1,0,1,4,21,126,1023,8240,84745,869410,10925883, 134232088,1994183205,29004251836,490209014571, 8250288250240,158096182329585,2993242910107914, 64115697136312563] |