n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 28 |
4 | 93 |
5 | 333 |
6 | 1289 |
7 | 5394 |
8 | 24366 |
9 | 118526 |
10 | 618924 |
11 | 3456942 |
12 | 20573391 |
13 | 129951231 |
14 | 867877107 |
15 | 6106194478 |
16 | 45109290477 |
17 | 348836705235 |
18 | 2816093142803 |
19 | 23673989688810 |
20 | 206794355179656 |
21 | 1873232870155036 |
22 | 17565534522745008 |
23 | 170237112831874188 |
[1,3,9,28,93,333,1289,5394,24366,118526,618924, 3456942,20573391,129951231,867877107,6106194478, 45109290477,348836705235,2816093142803, 23673989688810,206794355179656,1873232870155036, 17565534522745008,170237112831874188] |