n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 9 |
6 | 55 |
7 | 51 |
8 | 252 |
9 | 379 |
10 | 1491 |
11 | 1611 |
12 | 12236 |
13 | 10245 |
14 | 57057 |
15 | 121711 |
16 | 345888 |
17 | 474489 |
18 | 3589099 |
19 | 3397143 |
20 | 21983298 |
21 | 41570721 |
22 | 142617777 |
23 | 186027579 |
24 | 1476401628 |
25 | 1694455311 |
26 | 8146623393 |
27 | 15690140775 |
[0,0,1,6,9,55,51,252,379,1491,1611,12236,10245, 57057,121711,345888,474489,3589099,3397143, 21983298,41570721,142617777,186027579,1476401628, 1694455311,8146623393,15690140775] |