n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 17 |
3 | 80 |
4 | 369 |
5 | 1700 |
6 | 7841 |
7 | 36160 |
8 | 166753 |
9 | 768996 |
10 | 3546289 |
11 | 16354000 |
12 | 75417809 |
13 | 347795396 |
14 | 1603886913 |
15 | 7396455680 |
16 | 34109360321 |
17 | 157298104900 |
18 | 725393076049 |
19 | 3345209499600 |
20 | 15426707209777 |
21 | 71141522037604 |
22 | 328074947492321 |
23 | 1512944453384000 |
24 | 6977067089461281 |
[1,4,17,80,369,1700,7841,36160,166753,768996, 3546289,16354000,75417809,347795396,1603886913, 7396455680,34109360321,157298104900,725393076049, 3345209499600,15426707209777,71141522037604, 328074947492321,1512944453384000,6977067089461281] |