n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 9 |
5 | 20 |
6 | 279 |
7 | 512 |
8 | 19087 |
9 | 71602 |
10 | 636365 |
11 | 1517042 |
12 | 321965982 |
13 | 240609602 |
14 | 8809543877 |
15 | 144729615032 |
16 | 26818608209252 |
17 | 6603755558402 |
18 | 2737593592637477 |
[1,1,2,9,20,279,512,19087,71602,636365,1517042, 321965982,240609602,8809543877,144729615032, 26818608209252,6603755558402,2737593592637477] |