The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 90 |
| 4 | 2520 |
| 5 | 126630 |
| 6 | 9727740 |
| 7 | 979548570 |
| 8 | 129584342160 |
| 9 | 21655877754510 |
| 10 | 4450716903531780 |
| 11 | 1102163137590334050 |
| 12 | 323261459451529176600 |
| 13 | 110722946709029745152790 |
| 14 | 43768619617333612645900620 |
[1,0,0,90,2520,126630,9727740,979548570, 129584342160,21655877754510,4450716903531780, 1102163137590334050,323261459451529176600, 110722946709029745152790, 43768619617333612645900620] |