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| n | a(n) |
|---|---|
| 1 | 2187 |
| 2 | 78125 |
| 3 | 823543 |
| 4 | 19487171 |
| 5 | 62748517 |
| 6 | 410338673 |
| 7 | 893871739 |
| 8 | 3404825447 |
| 9 | 17249876309 |
| 10 | 27512614111 |
| 11 | 94931877133 |
| 12 | 194754273881 |
| 13 | 271818611107 |
| 14 | 506623120463 |
| 15 | 1174711139837 |
| 16 | 2488651484819 |
| 17 | 3142742836021 |
| 18 | 6060711605323 |
[2187,78125,823543,19487171,62748517,410338673, 893871739,3404825447,17249876309,27512614111, 94931877133,194754273881,271818611107, 506623120463,1174711139837,2488651484819, 3142742836021,6060711605323] |