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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 59 |
| 3 | 503 |
| 4 | 4049 |
| 5 | 32313 |
| 6 | 258353 |
| 7 | 2066359 |
| 8 | 16527691 |
| 9 | 132195391 |
| 10 | 1057349609 |
| 11 | 8457086257 |
| 12 | 67643015889 |
| 13 | 541034769831 |
| 14 | 4327403486059 |
| 15 | 34612231897959 |
| 16 | 276841898493041 |
| 17 | 2214287624855529 |
| 18 | 17710721217845921 |
| 19 | 141657137282377943 |
[1,59,503,4049,32313,258353,2066359,16527691, 132195391,1057349609,8457086257,67643015889, 541034769831,4327403486059,34612231897959, 276841898493041,2214287624855529, 17710721217845921,141657137282377943] |