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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 1657 |
| 3 | 426422 |
| 4 | 450288795 |
| 5 | 1182700979380 |
| 6 | 6184248124218800 |
| 7 | 56513375910372605548 |
| 8 | 826725568737937330039810 |
| 9 | 18171823971396715681105965282 |
| 10 | 572057633247843506849301892746850 |
| 11 | 24840621984533068280588275487942834483 |
| 12 | 1443495070617319156132945205013820325621405 |
[15,1657,426422,450288795,1182700979380, 6184248124218800,56513375910372605548, 826725568737937330039810, 18171823971396715681105965282, 572057633247843506849301892746850, 24840621984533068280588275487942834483, 1443495070617319156132945205013820325621405] |