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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 85 |
| 3 | 468 |
| 4 | 3159 |
| 5 | 20782 |
| 6 | 130303 |
| 7 | 849983 |
| 8 | 5499124 |
| 9 | 35347256 |
| 10 | 228635279 |
| 11 | 1476475552 |
| 12 | 9526162672 |
| 13 | 61524431404 |
| 14 | 397230521807 |
| 15 | 2564403167359 |
| 16 | 16557684534289 |
| 17 | 106902568041821 |
| 18 | 690192741799890 |
| 19 | 4456188932450215 |
[13,85,468,3159,20782,130303,849983,5499124, 35347256,228635279,1476475552,9526162672, 61524431404,397230521807,2564403167359, 16557684534289,106902568041821,690192741799890, 4456188932450215] |