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A073584 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 9 |
| 4 | 48 |
| 5 | 300 |
| 6 | 2520 |
| 7 | 22680 |
| 8 | 282240 |
| 9 | 3265920 |
| 10 | 43545600 |
| 11 | 618710400 |
| 12 | 10298534400 |
| 13 | 171243072000 |
| 14 | 3138418483200 |
| 15 | 61460695296000 |
| 16 | 1286751578112000 |
| 17 | 27743619391488000 |
| 18 | 640237370572800000 |
| 19 | 15448927751921664000 |
| 20 | 394130125324615680000 |
| 21 | 10422552203028725760000 |
| 22 | 288306186674956369920000 |
[1,1,9,48,300,2520,22680,282240,3265920,43545600, 618710400,10298534400,171243072000,3138418483200, 61460695296000,1286751578112000,27743619391488000, 640237370572800000,15448927751921664000, 394130125324615680000,10422552203028725760000, 288306186674956369920000] |