n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 15 |
3 | 115 |
4 | 1255 |
5 | 13671 |
6 | 160461 |
7 | 1936425 |
8 | 24071895 |
9 | 305313415 |
10 | 3939158905 |
11 | 51521082405 |
12 | 681635916325 |
13 | 9105864515125 |
14 | 122657982366375 |
15 | 1664151758259915 |
16 | 22720725637684215 |
17 | 311933068664333175 |
18 | 4303704125389134825 |
19 | 59640225721889127525 |
20 | 829774531966386480705 |
[1,1,15,115,1255,13671,160461,1936425,24071895, 305313415,3939158905,51521082405,681635916325, 9105864515125,122657982366375,1664151758259915, 22720725637684215,311933068664333175, 4303704125389134825,59640225721889127525, 829774531966386480705] |