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| n | a(n) |
|---|---|
| 1 | 23 |
| 2 | 557 |
| 3 | 21894 |
| 4 | 866396 |
| 5 | 34170727 |
| 6 | 1350570015 |
| 7 | 53369789699 |
| 8 | 2108712981800 |
| 9 | 83318930054700 |
| 10 | 3292096503338981 |
| 11 | 130077252787397712 |
| 12 | 5139609041198810834 |
| 13 | 203076105223297844491 |
| 14 | 8023938109223922493851 |
| 15 | 317041646252827399145319 |
[23,557,21894,866396,34170727,1350570015, 53369789699,2108712981800,83318930054700, 3292096503338981,130077252787397712, 5139609041198810834,203076105223297844491, 8023938109223922493851,317041646252827399145319] |