n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 17 |
4 | 66 |
5 | 247 |
6 | 918 |
7 | 3425 |
8 | 12862 |
9 | 48611 |
10 | 184746 |
11 | 705421 |
12 | 2704144 |
13 | 10400587 |
14 | 40116586 |
15 | 155117505 |
16 | 601080374 |
17 | 2333606203 |
18 | 9075135282 |
19 | 35345263781 |
20 | 137846528800 |
21 | 538257874419 |
22 | 2104098963698 |
23 | 8233430727577 |
24 | 32247603683076 |
[1,1,4,17,66,247,918,3425,12862,48611,184746, 705421,2704144,10400587,40116586,155117505, 601080374,2333606203,9075135282,35345263781, 137846528800,538257874419,2104098963698, 8233430727577,32247603683076] |