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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 27648 |
| 3 | 146356224 |
| 4 | 698512774464 |
| 5 | 3271331573452800 |
| 6 | 15258885095892902976 |
| 7 | 71111090441547013886784 |
| 8 | 331335100372867196224868352 |
| 9 | 1543757070688065237574186369344 |
| 10 | 7192607774929149127350811889484864 |
| 11 | 33511424900308657559195109303117533184 |
| 12 | 156134620449573478209362729027690283037248 |
[1,27648,146356224,698512774464,3271331573452800, 15258885095892902976,71111090441547013886784, 331335100372867196224868352, 1543757070688065237574186369344, 7192607774929149127350811889484864, 33511424900308657559195109303117533184, 156134620449573478209362729027690283037248] |