The OEIS is supported by the many generous donors to the OEIS Foundation.
A022564 as a simple table
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 4 |
| 10 | 16 |
| 11 | 84 |
| 12 | 408 |
[0,0,0,0,0,0,0,0,4,16,84,408] |
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 4 |
| 10 | 16 |
| 11 | 84 |
| 12 | 408 |
[0,0,0,0,0,0,0,0,4,16,84,408] |