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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 28 |
| 4 | 281 |
| 5 | 3126 |
| 6 | 48517 |
| 7 | 823544 |
| 8 | 16995617 |
| 9 | 387692650 |
| 10 | 10047310481 |
| 11 | 285311670612 |
| 12 | 8932562801857 |
| 13 | 302875106592254 |
| 14 | 11119129387084097 |
| 15 | 437899615088648176 |
| 16 | 18451106376806703617 |
| 17 | 827240261886336764178 |
| 18 | 39349894934527426209025 |
[1,5,28,281,3126,48517,823544,16995617,387692650, 10047310481,285311670612,8932562801857, 302875106592254,11119129387084097, 437899615088648176,18451106376806703617, 827240261886336764178,39349894934527426209025] |