n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 44 |
4 | 230 |
5 | 1242 |
6 | 6853 |
7 | 38376 |
8 | 217242 |
9 | 1239980 |
10 | 7123765 |
11 | 41141916 |
12 | 238637282 |
13 | 1389206210 |
14 | 8112107475 |
15 | 47495492400 |
16 | 278722764954 |
17 | 1638970147188 |
18 | 9654874654438 |
19 | 56965811111240 |
20 | 336590781348276 |
21 | 1991357644501170 |
[1,2,9,44,230,1242,6853,38376,217242,1239980, 7123765,41141916,238637282,1389206210,8112107475, 47495492400,278722764954,1638970147188, 9654874654438,56965811111240,336590781348276, 1991357644501170] |