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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 34 |
| 4 | 576 |
| 5 | 16296 |
| 6 | 691408 |
| 7 | 41069568 |
| 8 | 3252707328 |
| 9 | 331218217600 |
| 10 | 42159307194624 |
| 11 | 6558777387076608 |
| 12 | 1224428872399488000 |
| 13 | 270143735036619436032 |
| 14 | 69534931015726331203584 |
| 15 | 20651854796028308275851264 |
| 16 | 7009822878720340562163007488 |
| 17 | 2696576146784893519040303235072 |
| 18 | 1166999997199470676471689819258880 |
[0,1,4,34,576,16296,691408,41069568,3252707328, 331218217600,42159307194624,6558777387076608, 1224428872399488000,270143735036619436032, 69534931015726331203584, 20651854796028308275851264, 7009822878720340562163007488, 2696576146784893519040303235072, 1166999997199470676471689819258880] |