n | a(n) |
---|---|
3 | 1 |
4 | 6 |
5 | 35 |
6 | 225 |
7 | 1624 |
8 | 13132 |
9 | 118124 |
10 | 1172700 |
11 | 12753576 |
12 | 150917976 |
13 | 1931559552 |
14 | 26596717056 |
15 | 392156797824 |
16 | 6165817614720 |
17 | 102992244837120 |
18 | 1821602444624640 |
19 | 34012249593822720 |
20 | 668609730341153280 |
21 | 13803759753640704000 |
[1,6,35,225,1624,13132,118124,1172700,12753576, 150917976,1931559552,26596717056,392156797824, 6165817614720,102992244837120,1821602444624640, 34012249593822720,668609730341153280, 13803759753640704000] |