The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 7 |
| 13 | 89 |
| 14 | 655 |
| 15 | 3622 |
| 16 | 16348 |
| 17 | 63635 |
| 18 | 223997 |
| 19 | 720406 |
| 20 | 2148017 |
| 21 | 6015901 |
| 22 | 16005646 |
[0,0,0,0,0,0,0,0,0,0,0,0,7,89,655,3622,16348, 63635,223997,720406,2148017,6015901,16005646] |