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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 13 |
| 4 | 176 |
| 5 | 3886 |
| 6 | 125374 |
| 7 | 5550713 |
| 8 | 323184220 |
| 9 | 23969935266 |
| 10 | 2208185433708 |
| 11 | 247518073493022 |
| 12 | 33184572994243884 |
| 13 | 5244964339235985636 |
| 14 | 965302981114301621022 |
| 15 | 204679102209593395617929 |
[1,1,2,13,176,3886,125374,5550713,323184220, 23969935266,2208185433708,247518073493022, 33184572994243884,5244964339235985636, 965302981114301621022,204679102209593395617929] |