n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 81 |
4 | 435 |
5 | 2349 |
6 | 12681 |
7 | 68499 |
8 | 370023 |
9 | 1998945 |
10 | 10798821 |
11 | 58338495 |
12 | 315162657 |
13 | 1702608147 |
14 | 9198028791 |
15 | 49690672857 |
16 | 268444806483 |
17 | 1450224181197 |
18 | 7834572084033 |
19 | 42324849273915 |
20 | 228652292458773 |
21 | 1235252381526711 |
22 | 6673226101644267 |
23 | 36050889090859101 |
[1,3,15,81,435,2349,12681,68499,370023,1998945, 10798821,58338495,315162657,1702608147,9198028791, 49690672857,268444806483,1450224181197, 7834572084033,42324849273915,228652292458773, 1235252381526711,6673226101644267, 36050889090859101] |