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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 24 |
| 7 | 108 |
| 8 | 640 |
| 9 | 4492 |
| 10 | 36336 |
| 11 | 329900 |
| 12 | 3326788 |
| 13 | 36846288 |
| 14 | 444790512 |
| 15 | 5811886656 |
| 16 | 81729688428 |
| 17 | 1230752346368 |
| 18 | 19760413251956 |
| 19 | 336967037143596 |
| 20 | 6082255029733168 |
| 21 | 115852476579940152 |
| 22 | 2322315553428424200 |
| 23 | 48869596859895986108 |
[1,1,2,3,8,24,108,640,4492,36336,329900,3326788, 36846288,444790512,5811886656,81729688428, 1230752346368,19760413251956,336967037143596, 6082255029733168,115852476579940152, 2322315553428424200,48869596859895986108] |