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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 331 |
| 4 | 13561 |
| 5 | 776594 |
| 6 | 57773582 |
| 7 | 5320252480 |
| 8 | 586352480958 |
| 9 | 75438829494131 |
| 10 | 11116206652400681 |
| 11 | 1848033852642973772 |
| 12 | 342436117841931383400 |
| 13 | 70020229273505952925559 |
| 14 | 15667865938977592230047929 |
| 15 | 3809417116914053901413289249 |
| 16 | 1000291703885548521424635046427 |
[1,1,13,331,13561,776594,57773582,5320252480, 586352480958,75438829494131,11116206652400681, 1848033852642973772,342436117841931383400, 70020229273505952925559, 15667865938977592230047929, 3809417116914053901413289249, 1000291703885548521424635046427] |