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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 313 |
| 3 | 1249 |
| 4 | 13954 |
| 5 | 107723 |
| 6 | 946723 |
| 7 | 8143342 |
| 8 | 69406724 |
| 9 | 599014812 |
| 10 | 5123207331 |
| 11 | 44024389889 |
| 12 | 377614353499 |
| 13 | 3240377259448 |
| 14 | 27808393785858 |
| 15 | 238604898145361 |
| 16 | 2047584363969436 |
| 17 | 17569996355263865 |
| 18 | 150770179545151533 |
[3,313,1249,13954,107723,946723,8143342,69406724, 599014812,5123207331,44024389889,377614353499, 3240377259448,27808393785858,238604898145361, 2047584363969436,17569996355263865, 150770179545151533] |