n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 21 |
6 | 81 |
7 | 351 |
8 | 1233 |
9 | 5769 |
10 | 31041 |
11 | 142011 |
12 | 776601 |
13 | 4874013 |
14 | 27027729 |
15 | 168369111 |
16 | 1191911841 |
17 | 7678566801 |
18 | 53474964993 |
19 | 418199988339 |
20 | 3044269834281 |
21 | 23364756531621 |
22 | 199008751634001 |
23 | 1605461415071823 |
[1,1,1,3,9,21,81,351,1233,5769,31041,142011, 776601,4874013,27027729,168369111,1191911841, 7678566801,53474964993,418199988339,3044269834281, 23364756531621,199008751634001,1605461415071823] |