n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 9 |
3 | 37 |
4 | 137 |
5 | 487 |
6 | 1749 |
7 | 5901 |
8 | 19695 |
9 | 63832 |
10 | 202905 |
11 | 632689 |
12 | 1941394 |
13 | 5860868 |
14 | 17448558 |
15 | 51255292 |
16 | 148726841 |
17 | 426605755 |
18 | 1210569740 |
19 | 3400427281 |
20 | 9460683203 |
21 | 26083933370 |
22 | 71300381025 |
23 | 193313191005 |
24 | 520057831035 |
25 | 1388722752205 |
26 | 3682100198763 |
[1,1,9,37,137,487,1749,5901,19695,63832,202905, 632689,1941394,5860868,17448558,51255292, 148726841,426605755,1210569740,3400427281, 9460683203,26083933370,71300381025,193313191005, 520057831035,1388722752205,3682100198763] |