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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 97 |
| 4 | 901 |
| 5 | 29186 |
| 6 | 1647721 |
| 7 | 93837697 |
| 8 | 12290566873 |
| 9 | 4736355079682 |
| 10 | 1969233690270421 |
| 11 | 1126004701770879841 |
| 12 | 2327721451902521875261 |
| 13 | 7371705459667139440634882 |
| 14 | 24178816113044965430498802193 |
| 15 | 208545961878958994572139555513857 |
| 16 | 4688266673793881234527843412398379761 |
[1,2,13,97,901,29186,1647721,93837697,12290566873, 4736355079682,1969233690270421, 1126004701770879841,2327721451902521875261, 7371705459667139440634882, 24178816113044965430498802193, 208545961878958994572139555513857, 4688266673793881234527843412398379761] |