n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 18 |
4 | 126 |
5 | 966 |
6 | 7863 |
7 | 66696 |
8 | 583111 |
9 | 5217513 |
10 | 47547405 |
11 | 439777242 |
12 | 4117802109 |
13 | 38956162023 |
14 | 371795456373 |
15 | 3575401032544 |
16 | 34611064585803 |
17 | 336998629754631 |
18 | 3298200003722997 |
19 | 32428037256038775 |
20 | 320151289224740949 |
21 | 3172536384239678856 |
22 | 31544584654878015766 |
[1,1,3,18,126,966,7863,66696,583111,5217513, 47547405,439777242,4117802109,38956162023, 371795456373,3575401032544,34611064585803, 336998629754631,3298200003722997, 32428037256038775,320151289224740949, 3172536384239678856,31544584654878015766] |