n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 225 |
7 | 1575 |
8 | 11025 |
9 | 99224 |
10 | 893015 |
11 | 9821203 |
12 | 108031161 |
13 | 1403167368 |
14 | 18239614827 |
15 | 273001402026 |
16 | 4094100409041 |
17 | 69325319221265 |
18 | 1178005630046455 |
19 | 22247669184972959 |
20 | 422391796578333725 |
21 | 8797758481967862297 |
22 | 184548615259788777783 |
[1,1,1,3,9,45,225,1575,11025,99224,893015,9821203, 108031161,1403167368,18239614827,273001402026, 4094100409041,69325319221265,1178005630046455, 22247669184972959,422391796578333725, 8797758481967862297,184548615259788777783] |