n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 11 |
4 | 50 |
5 | 274 |
6 | 1764 |
7 | 13132 |
8 | 118124 |
9 | 1172700 |
10 | 12753576 |
11 | 150917976 |
12 | 1931559552 |
13 | 26596717056 |
14 | 392156797824 |
15 | 6165817614720 |
16 | 102992244837120 |
17 | 1821602444624640 |
18 | 34012249593822720 |
19 | 668609730341153280 |
20 | 13803759753640704000 |
21 | 298631902863216384000 |
[1,1,3,11,50,274,1764,13132,118124,1172700, 12753576,150917976,1931559552,26596717056, 392156797824,6165817614720,102992244837120, 1821602444624640,34012249593822720, 668609730341153280,13803759753640704000, 298631902863216384000] |