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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 85 |
| 4 | 1024 |
| 5 | 13107 |
| 6 | 174760 |
| 7 | 2396745 |
| 8 | 33554432 |
| 9 | 477218560 |
| 10 | 6871947672 |
| 11 | 99955602525 |
| 12 | 1466015503360 |
| 13 | 21651921285435 |
| 14 | 321685687669320 |
| 15 | 4803839602524143 |
| 16 | 72057594037927936 |
| 17 | 1085102592571150095 |
| 18 | 16397105843297320960 |
| 19 | 248545604361560274405 |
| 20 | 3777893186295716170752 |
| 21 | 57567896172125197996605 |
[1,8,85,1024,13107,174760,2396745,33554432, 477218560,6871947672,99955602525,1466015503360, 21651921285435,321685687669320,4803839602524143, 72057594037927936,1085102592571150095, 16397105843297320960,248545604361560274405, 3777893186295716170752,57567896172125197996605] |