n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 54 |
4 | 261 |
5 | 1323 |
6 | 6939 |
7 | 37341 |
8 | 205011 |
9 | 1143801 |
10 | 6466230 |
11 | 36960300 |
12 | 213243435 |
13 | 1240219269 |
14 | 7263473148 |
15 | 42799541886 |
16 | 253556163243 |
17 | 1509356586897 |
18 | 9023497273548 |
19 | 54154973176074 |
20 | 326154592965879 |
21 | 1970575690572297 |
[1,3,12,54,261,1323,6939,37341,205011,1143801, 6466230,36960300,213243435,1240219269,7263473148, 42799541886,253556163243,1509356586897, 9023497273548,54154973176074,326154592965879, 1970575690572297] |