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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 57 |
| 2 | 1710 |
| 3 | 35815 |
| 4 | 586815 |
| 5 | 7997157 |
| 6 | 94175267 |
| 7 | 983458849 |
| 8 | 9279004863 |
| 9 | 80218101555 |
| 10 | 642408637594 |
| 11 | 4807304399931 |
| 12 | 33855173217278 |
| 13 | 225702273908048 |
| 14 | 1431470152072364 |
| 15 | 8673471170235715 |
| 16 | 50389686887219910 |
| 17 | 281575909008910196 |
| 18 | 1517580284619183809 |
[1,57,1710,35815,586815,7997157,94175267, 983458849,9279004863,80218101555,642408637594, 4807304399931,33855173217278,225702273908048, 1431470152072364,8673471170235715, 50389686887219910,281575909008910196, 1517580284619183809] |