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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 23 |
| 2 | 939 |
| 3 | 41813 |
| 4 | 1895145 |
| 5 | 86208957 |
| 6 | 3924499731 |
| 7 | 178682349823 |
| 8 | 8135650498647 |
| 9 | 370429531112741 |
| 10 | 16866286184557689 |
| 11 | 767950873073579951 |
| 12 | 34966119230441665595 |
| 13 | 1592067343861413081837 |
| 14 | 72489555274710984629691 |
| 15 | 3300573714050654978094583 |
| 16 | 150280779093325614402294089 |
[1,23,939,41813,1895145,86208957,3924499731, 178682349823,8135650498647,370429531112741, 16866286184557689,767950873073579951, 34966119230441665595,1592067343861413081837, 72489555274710984629691,3300573714050654978094583, 150280779093325614402294089] |