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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 697 |
| 3 | 1333 |
| 4 | 1909 |
| 5 | 3901 |
| 6 | 96361 |
| 7 | 130153 |
| 8 | 163201 |
| 9 | 2708413 |
| 10 | 2768581 |
| 11 | 4013833 |
| 12 | 4312681 |
| 13 | 4658449 |
| 14 | 6392257 |
| 15 | 7478041 |
| 16 | 8766061 |
| 17 | 8883841 |
| 18 | 9427657 |
| 19 | 9699181 |
| 20 | 12064333 |
| 21 | 14489437 |
| 22 | 15042553 |
| 23 | 16260901 |
| 24 | 16904101 |
| 25 | 18116737 |
| 26 | 21396313 |
| 27 | 28005301 |
| 28 | 29751229 |
| 29 | 31837801 |
| 30 | 36640993 |
[21,697,1333,1909,3901,96361,130153,163201, 2708413,2768581,4013833,4312681,4658449,6392257, 7478041,8766061,8883841,9427657,9699181,12064333, 14489437,15042553,16260901,16904101,18116737, 21396313,28005301,29751229,31837801,36640993] |