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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 58 |
| 3 | 1578 |
| 4 | 38984 |
| 5 | 602804 |
| 6 | 12071462 |
| 7 | 175905310 |
| 8 | 3023313284 |
| 9 | 43551685370 |
| 10 | 682958971778 |
| 11 | 9735477214522 |
| 12 | 144397808917246 |
| 13 | 2033155413979838 |
| 14 | 29105375742858518 |
| 15 | 404654754079984324 |
| 16 | 5656098437704094140 |
| 17 | 77710312229803403554 |
| 18 | 1067886114091399967842 |
[1,58,1578,38984,602804,12071462,175905310, 3023313284,43551685370,682958971778,9735477214522, 144397808917246,2033155413979838, 29105375742858518,404654754079984324, 5656098437704094140,77710312229803403554, 1067886114091399967842] |