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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 1323 |
| 3 | 83349 |
| 4 | 4523326 |
| 5 | 231625525 |
| 6 | 11291781118 |
| 7 | 533496497134 |
| 8 | 24638192559193 |
| 9 | 1119739461968029 |
| 10 | 50302612987674436 |
| 11 | 2240926584904643898 |
| 12 | 99224887445365781047 |
| 13 | 4374082379524633959645 |
| 14 | 192196709195804438294930 |
[21,1323,83349,4523326,231625525,11291781118, 533496497134,24638192559193,1119739461968029, 50302612987674436,2240926584904643898, 99224887445365781047,4374082379524633959645, 192196709195804438294930] |