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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 75 |
| 5 | 375 |
| 6 | 9375 |
| 7 | 159375 |
| 8 | 71559375 |
| 9 | 1195399359375 |
| 10 | 353915911333359375 |
| 11 | 51915571117579153359375 |
| 12 | 753315397517553377717399173359375 |
| 13 | 3319771735775931191533111595353537393933359375 |
[1,3,15,75,375,9375,159375,71559375,1195399359375, 353915911333359375,51915571117579153359375, 753315397517553377717399173359375, 3319771735775931191533111595353537393933359375] |