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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 221 |
| 3 | 4641 |
| 4 | 116025 |
| 5 | 3364725 |
| 6 | 111035925 |
| 7 | 4108329225 |
| 8 | 168441498225 |
| 9 | 7579867420125 |
| 10 | 371413503586125 |
| 11 | 19684915690064625 |
| 12 | 1122040194333683625 |
| 13 | 68444451854354701125 |
| 14 | 4448889370533055573125 |
| 15 | 306973366566780834545625 |
[1,13,221,4641,116025,3364725,111035925, 4108329225,168441498225,7579867420125, 371413503586125,19684915690064625, 1122040194333683625,68444451854354701125, 4448889370533055573125,306973366566780834545625] |