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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 17689 |
| 3 | 378225 |
| 4 | 4109707449 |
| 5 | 87870152041 |
| 6 | 954775454112481 |
| 7 | 20414169462254569 |
| 8 | 221815343046210267025 |
| 9 | 4742660677722035990769 |
| 10 | 51532584126226886201833161 |
| 11 | 1101824413949324675985344641 |
| 12 | 11972153009151467313136073526409 |
| 13 | 255978051492792346696545201859225 |
[1,17689,378225,4109707449,87870152041, 954775454112481,20414169462254569, 221815343046210267025,4742660677722035990769, 51532584126226886201833161, 1101824413949324675985344641, 11972153009151467313136073526409, 255978051492792346696545201859225] |