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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 68 |
| 5 | 330 |
| 6 | 7674 |
| 7 | 73080 |
| 8 | 1883440 |
| 9 | 28281960 |
| 10 | 818625960 |
| 11 | 17120406600 |
| 12 | 557507325000 |
| 13 | 15014517495120 |
| 14 | 548643259812816 |
| 15 | 18056683281775320 |
| 16 | 736892260092195840 |
| 17 | 28579282973977498560 |
| 18 | 1295028345251832359616 |
| 19 | 57666859088090317591680 |
[1,0,2,3,68,330,7674,73080,1883440,28281960, 818625960,17120406600,557507325000,15014517495120, 548643259812816,18056683281775320, 736892260092195840,28579282973977498560, 1295028345251832359616,57666859088090317591680] |