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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 6 |
| 3 | 156 |
| 4 | 1576 |
| 5 | 21787 |
| 6 | 268802 |
| 7 | 3243936 |
| 8 | 39741611 |
| 9 | 487928765 |
| 10 | 5990285350 |
| 11 | 73509953021 |
| 12 | 902263598864 |
| 13 | 11075142387448 |
| 14 | 135948000511051 |
| 15 | 1668765875414321 |
| 16 | 20484231805522465 |
| 17 | 251446083838676603 |
[13,6,156,1576,21787,268802,3243936,39741611, 487928765,5990285350,73509953021,902263598864, 11075142387448,135948000511051,1668765875414321, 20484231805522465,251446083838676603] |