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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 169 |
| 3 | 7141 |
| 4 | 301741 |
| 5 | 12749989 |
| 6 | 538747549 |
| 7 | 22764640981 |
| 8 | 961914128461 |
| 9 | 40645437426949 |
| 10 | 1717462645311229 |
| 11 | 72570948297479221 |
| 12 | 3066467006530462381 |
| 13 | 129572785291363217509 |
| 14 | 5475065165353811151709 |
| 15 | 231347489347123368595861 |
| 16 | 9775529461439509493215501 |
[4,169,7141,301741,12749989,538747549,22764640981, 961914128461,40645437426949,1717462645311229, 72570948297479221,3066467006530462381, 129572785291363217509,5475065165353811151709, 231347489347123368595861, 9775529461439509493215501] |