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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 17 |
| 5 | 91 |
| 6 | 379 |
| 7 | 721 |
| 8 | 35849 |
| 9 | 614893 |
| 10 | 6800951 |
| 11 | 607326679 |
| 12 | 3651532639 |
| 13 | 851897554247 |
| 14 | 24724573280923 |
| 15 | 301787157353771 |
| 16 | 14188276949397301 |
| 17 | 22662903194758542865 |
| 18 | 430644772287132696121 |
| 19 | 1800653989272587268758525 |
| 20 | 369150309888695460837999593 |
[1,1,5,17,91,379,721,35849,614893,6800951, 607326679,3651532639,851897554247,24724573280923, 301787157353771,14188276949397301, 22662903194758542865,430644772287132696121, 1800653989272587268758525, 369150309888695460837999593] |