n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 44 |
5 | 270 |
6 | 2139 |
7 | 18837 |
8 | 186808 |
9 | 2070828 |
10 | 25861140 |
11 | 350000640 |
12 | 5145279611 |
13 | 81492295079 |
14 | 1381583542234 |
15 | 25097285838765 |
16 | 484602684624080 |
17 | 9894705390149400 |
18 | 213418984780492164 |
19 | 4842425874827849868 |
20 | 115231446547162291200 |
21 | 2874808892527026177240 |
[1,1,2,9,44,270,2139,18837,186808,2070828, 25861140,350000640,5145279611,81492295079, 1381583542234,25097285838765,484602684624080, 9894705390149400,213418984780492164, 4842425874827849868,115231446547162291200, 2874808892527026177240] |