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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 15 |
| 3 | 21147 |
| 4 | 10480142147 |
| 5 | 4638590332229999353 |
| 6 | 3819714729894818339975525681317 |
| 7 | 10726137154573358400342215518590002633917247281 |
[1,1,15,21147,10480142147,4638590332229999353, 3819714729894818339975525681317, 10726137154573358400342215518590002633917247281] |