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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 106 |
| 4 | 1035 |
| 5 | 11301 |
| 6 | 137774 |
| 7 | 1863044 |
| 8 | 27733869 |
| 9 | 451238935 |
| 10 | 7972318200 |
| 11 | 152065270974 |
| 12 | 3115418734415 |
| 13 | 68245059703289 |
| 14 | 1591993733475570 |
| 15 | 39406010771574856 |
| 16 | 1031649940977825633 |
| 17 | 28483179899706237483 |
| 18 | 827159099070697636124 |
| 19 | 25205610503231757308450 |
[0,1,12,106,1035,11301,137774,1863044,27733869, 451238935,7972318200,152065270974,3115418734415, 68245059703289,1591993733475570,39406010771574856, 1031649940977825633,28483179899706237483, 827159099070697636124,25205610503231757308450] |