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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 72 |
| 3 | 744 |
| 4 | 11256 |
| 5 | 201960 |
| 6 | 3871416 |
| 7 | 76138536 |
| 8 | 1512609912 |
| 9 | 30171384168 |
| 10 | 602782587960 |
| 11 | 12050495247528 |
| 12 | 240968665611768 |
| 13 | 4819043435788776 |
| 14 | 96378229818994104 |
| 15 | 1927543485550004520 |
| 16 | 38550700825394191224 |
| 17 | 771012665426135994984 |
| 18 | 15420242499878035355448 |
| 19 | 308404763528431125030312 |
[12,72,744,11256,201960,3871416,76138536, 1512609912,30171384168,602782587960, 12050495247528,240968665611768,4819043435788776, 96378229818994104,1927543485550004520, 38550700825394191224,771012665426135994984, 15420242499878035355448,308404763528431125030312] |