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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 490 |
| 3 | 21637 |
| 4 | 1121505 |
| 5 | 3913864295 |
| 6 | 1131238503938606 |
| 7 | 78801255302666615 |
| 8 | 5589233202595404488 |
| 9 | 29349508915133986374841 |
| 10 | 2163909235608484556362424 |
| 11 | 913865816485680423486405066750 |
| 12 | 191623400974625892978847721669762887224010 |
[15,490,21637,1121505,3913864295,1131238503938606, 78801255302666615,5589233202595404488, 29349508915133986374841,2163909235608484556362424, 913865816485680423486405066750, 191623400974625892978847721669762887224010] |