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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2187 |
| 3 | 15625 |
| 4 | 823543 |
| 5 | 1771561 |
| 6 | 62748517 |
| 7 | 24137569 |
| 8 | 893871739 |
| 9 | 148035889 |
| 10 | 594823321 |
| 11 | 27512614111 |
| 12 | 94931877133 |
| 13 | 4750104241 |
| 14 | 271818611107 |
| 15 | 10779215329 |
| 16 | 22164361129 |
| 17 | 42180533641 |
| 18 | 3142742836021 |
| 19 | 6060711605323 |
| 20 | 128100283921 |
| 21 | 11047398519097 |
| 22 | 19203908986159 |
| 23 | 326940373369 |
[2,2187,15625,823543,1771561,62748517,24137569, 893871739,148035889,594823321,27512614111, 94931877133,4750104241,271818611107,10779215329, 22164361129,42180533641,3142742836021, 6060711605323,128100283921,11047398519097, 19203908986159,326940373369] |