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| n | a(n) |
|---|---|
| 1 | 642 |
| 2 | 56754 |
| 3 | 2173554 |
| 4 | 50108414 |
| 5 | 804566180 |
| 6 | 9790184488 |
| 7 | 95420380090 |
| 8 | 774600507974 |
| 9 | 5391017644856 |
| 10 | 32890239598008 |
| 11 | 179007489630476 |
| 12 | 881467345491584 |
| 13 | 3972721376352724 |
| 14 | 16545720243662726 |
| 15 | 64195774252619306 |
[642,56754,2173554,50108414,804566180,9790184488, 95420380090,774600507974,5391017644856, 32890239598008,179007489630476,881467345491584, 3972721376352724,16545720243662726, 64195774252619306] |