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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 67 |
| 3 | 1090 |
| 4 | 23265 |
| 5 | 614302 |
| 6 | 19323163 |
| 7 | 705288522 |
| 8 | 29296813825 |
| 9 | 1364468928022 |
| 10 | 70414831288275 |
| 11 | 3987980655931570 |
| 12 | 245910243177940897 |
| 13 | 16399345182278307822 |
| 14 | 1176033825828643912747 |
| 15 | 90242683036826223141370 |
| 16 | 7377887848681408224106497 |
| 17 | 640225878087732419052020134 |
[1,6,67,1090,23265,614302,19323163,705288522, 29296813825,1364468928022,70414831288275, 3987980655931570,245910243177940897, 16399345182278307822,1176033825828643912747, 90242683036826223141370,7377887848681408224106497, 640225878087732419052020134] |