n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 225 |
7 | 1575 |
8 | 11025 |
9 | 99225 |
10 | 893025 |
11 | 9823275 |
12 | 108056025 |
13 | 1404728325 |
14 | 18261468225 |
15 | 273922023375 |
16 | 4108832377650 |
17 | 69850150420050 |
18 | 1187452281465450 |
19 | 22561593347843550 |
20 | 428670250038780750 |
21 | 9002075250814395750 |
22 | 189043575317350503750 |
[1,1,1,3,9,45,225,1575,11025,99225,893025,9823275, 108056025,1404728325,18261468225,273922023375, 4108832377650,69850150420050,1187452281465450, 22561593347843550,428670250038780750, 9002075250814395750,189043575317350503750] |