n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 9 |
3 | 18 |
4 | 64 |
5 | 172 |
6 | 477 |
7 | 1368 |
8 | 3681 |
9 | 10485 |
10 | 28701 |
11 | 80829 |
12 | 225090 |
13 | 632160 |
14 | 1778553 |
15 | 5010948 |
16 | 14181849 |
17 | 40161357 |
18 | 114151716 |
19 | 324873027 |
20 | 926918784 |
21 | 2649218580 |
22 | 7585705665 |
23 | 21758756931 |
24 | 62508649059 |
25 | 179859399129 |
26 | 518234494662 |
27 | 1495275239115 |
28 | 4319808231645 |
29 | 12495043092609 |
30 | 36183457564425 |
[1,1,9,18,64,172,477,1368,3681,10485,28701,80829, 225090,632160,1778553,5010948,14181849,40161357, 114151716,324873027,926918784,2649218580, 7585705665,21758756931,62508649059,179859399129, 518234494662,1495275239115,4319808231645, 12495043092609,36183457564425] |