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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 31 |
| 3 | 2481 |
| 4 | 371881 |
| 5 | 89281461 |
| 6 | 31274052351 |
| 7 | 15020526041221 |
| 8 | 9461707887414161 |
| 9 | 7560380738419084201 |
| 10 | 7466459670646734124671 |
| 11 | 8925493084998518977531001 |
| 12 | 12696331763378714706289411961 |
| 13 | 21186586117648690791837844061341 |
| 14 | 40976310644118022811682503135528671 |
| 15 | 90905327647146969025291153908894514381 |
| 16 | 229256189615621846477632508681520371943201 |
[1,31,2481,371881,89281461,31274052351, 15020526041221,9461707887414161, 7560380738419084201,7466459670646734124671, 8925493084998518977531001, 12696331763378714706289411961, 21186586117648690791837844061341, 40976310644118022811682503135528671, 90905327647146969025291153908894514381, 229256189615621846477632508681520371943201] |