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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 273 |
| 3 | 4641 |
| 4 | 85085 |
| 5 | 1514513 |
| 6 | 27261234 |
| 7 | 488605194 |
| 8 | 8771626578 |
| 9 | 157373300370 |
| 10 | 2824135408458 |
| 11 | 50675778059634 |
| 12 | 909348684070099 |
| 13 | 16317540120588343 |
| 14 | 292806787575013635 |
| 15 | 5254201798026392211 |
| 16 | 94282845030238533383 |
| 17 | 1691836875411111866723 |
| 18 | 30358781826262552258596 |
[1,13,273,4641,85085,1514513,27261234,488605194, 8771626578,157373300370,2824135408458, 50675778059634,909348684070099,16317540120588343, 292806787575013635,5254201798026392211, 94282845030238533383,1691836875411111866723, 30358781826262552258596] |