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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 51 |
| 4 | 507 |
| 5 | 4947 |
| 6 | 58243 |
| 7 | 841443 |
| 8 | 14240763 |
| 9 | 269512483 |
| 10 | 5524472451 |
| 11 | 120183938835 |
| 12 | 2738420763131 |
| 13 | 64760819179635 |
| 14 | 1579226738429187 |
| 15 | 39515677808716739 |
| 16 | 1010750709382934523 |
| 17 | 26349289260686093379 |
| 18 | 698387854199468231427 |
| 19 | 18783213754115549685747 |
| 20 | 511772677524431483886075 |
[3,3,51,507,4947,58243,841443,14240763,269512483, 5524472451,120183938835,2738420763131, 64760819179635,1579226738429187,39515677808716739, 1010750709382934523,26349289260686093379, 698387854199468231427,18783213754115549685747, 511772677524431483886075] |