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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 49 |
| 4 | 793 |
| 5 | 19361 |
| 6 | 672061 |
| 7 | 31721425 |
| 8 | 1963804529 |
| 9 | 154746407233 |
| 10 | 15136503333301 |
| 11 | 1799712380844401 |
| 12 | 255578390749947145 |
| 13 | 42713809784784354529 |
| 14 | 8296411053128532892013 |
| 15 | 1852797862395580239567121 |
| 16 | 471358206112272764630500321 |
| 17 | 135500644700064476406317390465 |
[1,1,5,49,793,19361,672061,31721425,1963804529, 154746407233,15136503333301,1799712380844401, 255578390749947145,42713809784784354529, 8296411053128532892013,1852797862395580239567121, 471358206112272764630500321, 135500644700064476406317390465] |