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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 527 |
| 3 | 8390 |
| 4 | 122121 |
| 5 | 1683768 |
| 6 | 22407907 |
| 7 | 291019450 |
| 8 | 3713967341 |
| 9 | 46787388908 |
| 10 | 583658682087 |
| 11 | 7226065372110 |
| 12 | 88934701511761 |
| 13 | 1089437114484448 |
| 14 | 13295459966641067 |
| 15 | 161767703674942370 |
[1,28,527,8390,122121,1683768,22407907,291019450, 3713967341,46787388908,583658682087,7226065372110, 88934701511761,1089437114484448,13295459966641067, 161767703674942370] |