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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 518 |
| 3 | 3550 |
| 4 | 23524 |
| 5 | 157476 |
| 6 | 1051870 |
| 7 | 7027770 |
| 8 | 46953514 |
| 9 | 313711862 |
| 10 | 2095963398 |
| 11 | 14003608312 |
| 12 | 93561234452 |
| 13 | 625103107952 |
| 14 | 4176451826546 |
| 15 | 27903796991886 |
| 16 | 186431421801416 |
| 17 | 1245589462955974 |
| 18 | 8322058035168122 |
| 19 | 55601505834527494 |
[81,518,3550,23524,157476,1051870,7027770, 46953514,313711862,2095963398,14003608312, 93561234452,625103107952,4176451826546, 27903796991886,186431421801416,1245589462955974, 8322058035168122,55601505834527494] |