n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 7 |
4 | 39 |
5 | 196 |
6 | 930 |
7 | 4257 |
8 | 19019 |
9 | 83512 |
10 | 361998 |
11 | 1553630 |
12 | 6615686 |
13 | 27992472 |
14 | 117823940 |
15 | 493768485 |
16 | 2061580275 |
17 | 8580127920 |
18 | 35611376790 |
19 | 147447066690 |
20 | 609200868210 |
21 | 2512267906200 |
22 | 10342848445020 |
23 | 42516521451690 |
24 | 174535009040574 |
[0,1,7,39,196,930,4257,19019,83512,361998,1553630, 6615686,27992472,117823940,493768485,2061580275, 8580127920,35611376790,147447066690,609200868210, 2512267906200,10342848445020,42516521451690, 174535009040574] |