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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 159 |
| 3 | 7445 |
| 4 | 381958 |
| 5 | 19490790 |
| 6 | 996536552 |
| 7 | 50933680120 |
| 8 | 2603456557653 |
| 9 | 133072628448179 |
| 10 | 6801873967993408 |
| 11 | 347670725973943044 |
| 12 | 17770830778194675356 |
| 13 | 908337669425005770376 |
| 14 | 46428742540607711341143 |
[4,159,7445,381958,19490790,996536552,50933680120, 2603456557653,133072628448179,6801873967993408, 347670725973943044,17770830778194675356, 908337669425005770376,46428742540607711341143] |