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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 612 |
| 2 | 69192 |
| 3 | 3096108 |
| 4 | 75880080 |
| 5 | 1200854772 |
| 6 | 13577175768 |
| 7 | 117479955132 |
| 8 | 817605614880 |
| 9 | 4750742040452 |
| 10 | 23720309079912 |
| 11 | 104102585828172 |
| 12 | 408937561539504 |
| 13 | 1459118355905556 |
| 14 | 4786309424854008 |
| 15 | 14579158152013788 |
| 16 | 41583709699357248 |
| 17 | 111852394064751780 |
[1,612,69192,3096108,75880080,1200854772, 13577175768,117479955132,817605614880, 4750742040452,23720309079912,104102585828172, 408937561539504,1459118355905556,4786309424854008, 14579158152013788,41583709699357248, 111852394064751780] |