n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 21 |
3 | 138 |
4 | 1029 |
5 | 7878 |
6 | 62751 |
7 | 508521 |
8 | 4185885 |
9 | 34819986 |
10 | 292135143 |
11 | 2467528563 |
12 | 20958538377 |
13 | 178846047741 |
14 | 1532203949982 |
15 | 13171424183184 |
16 | 113562780734352 |
17 | 981679181808261 |
18 | 8505577753517235 |
19 | 73846557073784937 |
20 | 642328501788394527 |
[1,3,21,138,1029,7878,62751,508521,4185885, 34819986,292135143,2467528563,20958538377, 178846047741,1532203949982,13171424183184, 113562780734352,981679181808261,8505577753517235, 73846557073784937,642328501788394527] |