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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 16 |
| 3 | 258 |
| 4 | 4563 |
| 5 | 91711 |
| 6 | 1752652 |
| 7 | 33825987 |
| 8 | 653183942 |
| 9 | 12600432002 |
| 10 | 243080087186 |
| 11 | 4689839536009 |
| 12 | 90482737755713 |
| 13 | 1745684561683732 |
| 14 | 33679631409545263 |
| 15 | 649784599619041645 |
| 16 | 12536354917749688506 |
| 17 | 241865054799427771058 |
[0,16,258,4563,91711,1752652,33825987,653183942, 12600432002,243080087186,4689839536009, 90482737755713,1745684561683732,33679631409545263, 649784599619041645,12536354917749688506, 241865054799427771058] |