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| n | a(n) |
|---|---|
| 12 | 1 |
| 13 | 8191 |
| 14 | 44731051 |
| 15 | 209386049731 |
| 16 | 914807651274739 |
| 17 | 3867895279362300499 |
| 18 | 16094312257426532376339 |
| 19 | 66441249531569955747981459 |
| 20 | 273210326382611632738979052435 |
| 21 | 1121258922081448861468067825426835 |
| 22 | 4597164868683271949171164500871212435 |
[1,8191,44731051,209386049731,914807651274739, 3867895279362300499,16094312257426532376339, 66441249531569955747981459, 273210326382611632738979052435, 1121258922081448861468067825426835, 4597164868683271949171164500871212435] |