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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 169 |
| 3 | 1153 |
| 4 | 6837 |
| 5 | 35277 |
| 6 | 170409 |
| 7 | 783557 |
| 8 | 3498981 |
| 9 | 15313557 |
| 10 | 66183221 |
| 11 | 283695069 |
| 12 | 1209894989 |
| 13 | 5143701217 |
| 14 | 21827038973 |
| 15 | 92522770909 |
| 16 | 391969130401 |
| 17 | 1660088519969 |
| 18 | 7030078814173 |
| 19 | 29769974336161 |
| 20 | 126068348345329 |
[13,169,1153,6837,35277,170409,783557,3498981, 15313557,66183221,283695069,1209894989,5143701217, 21827038973,92522770909,391969130401, 1660088519969,7030078814173,29769974336161, 126068348345329] |