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| n | a(n) |
|---|---|
| 3 | 13 |
| 4 | 106 |
| 5 | 1105 |
| 6 | 12075 |
| 7 | 141533 |
| 8 | 1812216 |
| 9 | 25188019 |
| 10 | 378725365 |
| 11 | 6135529675 |
| 12 | 106586385708 |
| 13 | 1976799958367 |
| 14 | 38978490654831 |
| 15 | 814024466784025 |
| 16 | 17943457752971680 |
| 17 | 416183933276776375 |
| 18 | 10128962147830237953 |
| 19 | 258021086313431979827 |
| 20 | 6863916836407264864380 |
[13,106,1105,12075,141533,1812216,25188019, 378725365,6135529675,106586385708,1976799958367, 38978490654831,814024466784025,17943457752971680, 416183933276776375,10128962147830237953, 258021086313431979827,6863916836407264864380] |