n | a(n) |
---|---|
1 | 1 |
2 | 9 |
3 | 63 |
4 | 444 |
5 | 3109 |
6 | 21765 |
7 | 152355 |
8 | 1066488 |
9 | 7465417 |
10 | 52257921 |
11 | 365805447 |
12 | 2560638132 |
13 | 17924466925 |
14 | 125471268477 |
15 | 878298879339 |
16 | 6148092155376 |
17 | 43036645087633 |
18 | 301256515613433 |
19 | 2108795609294031 |
20 | 14761569265058220 |
21 | 103330984855407541 |
22 | 723316893987852789 |
[1,9,63,444,3109,21765,152355,1066488,7465417, 52257921,365805447,2560638132,17924466925, 125471268477,878298879339,6148092155376, 43036645087633,301256515613433,2108795609294031, 14761569265058220,103330984855407541, 723316893987852789] |