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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 633 |
| 3 | 10787 |
| 4 | 166481 |
| 5 | 2416827 |
| 6 | 33681481 |
| 7 | 456072739 |
| 8 | 6046236801 |
| 9 | 78876961163 |
| 10 | 1016157547769 |
| 11 | 12960408919731 |
| 12 | 163959874019761 |
| 13 | 2060322716086939 |
| 14 | 25744836645629097 |
| 15 | 320169349603453763 |
[1,31,633,10787,166481,2416827,33681481,456072739, 6046236801,78876961163,1016157547769, 12960408919731,163959874019761,2060322716086939, 25744836645629097,320169349603453763] |