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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 13 |
| 6 | 23 |
| 7 | 101 |
| 8 | 307 |
| 9 | 1201 |
| 10 | 1453 |
| 11 | 13463 |
| 12 | 15773 |
| 13 | 177329 |
| 14 | 203069 |
| 15 | 227093 |
| 16 | 499231 |
| 17 | 7766207 |
| 18 | 938543 |
| 19 | 16470957 |
| 20 | 17764249 |
| 21 | 56987867 |
| 22 | 60515027 |
| 23 | 1314248101 |
| 24 | 462870797 |
| 25 | 2433336849 |
| 26 | 2547743449 |
| 27 | 71763644723 |
| 28 | 74631981623 |
| 29 | 2084014033867 |
| 30 | 2161650352627 |
[1,1,1,5,13,23,101,307,1201,1453,13463,15773, 177329,203069,227093,499231,7766207,938543, 16470957,17764249,56987867,60515027,1314248101, 462870797,2433336849,2547743449,71763644723, 74631981623,2084014033867,2161650352627] |