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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 37 |
| 5 | 121 |
| 6 | 1201 |
| 7 | 5041 |
| 8 | 62161 |
| 9 | 423361 |
| 10 | 5473441 |
| 11 | 39916801 |
| 12 | 818959681 |
| 13 | 6227020801 |
| 14 | 130784734081 |
| 15 | 1536517382401 |
| 16 | 32256486662401 |
| 17 | 355687428096001 |
| 18 | 10679532671808001 |
| 19 | 121645100408832001 |
| 20 | 3770998783116364801 |
| 21 | 59616236292028416001 |
| 22 | 1686001119824999577601 |
[1,3,7,37,121,1201,5041,62161,423361,5473441, 39916801,818959681,6227020801,130784734081, 1536517382401,32256486662401,355687428096001, 10679532671808001,121645100408832001, 3770998783116364801,59616236292028416001, 1686001119824999577601] |