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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 8823 |
| 3 | 709814 |
| 4 | 18707320 |
| 5 | 251002319 |
| 6 | 2149795141 |
| 7 | 13385651492 |
| 8 | 65717571120 |
| 9 | 268511791119 |
| 10 | 948021599547 |
| 11 | 2972106528666 |
| 12 | 8443442678840 |
| 13 | 22076610372895 |
| 14 | 53774915777897 |
| 15 | 123215084622184 |
| 16 | 267660712891040 |
| 17 | 554792683762767 |
[15,8823,709814,18707320,251002319,2149795141, 13385651492,65717571120,268511791119,948021599547, 2972106528666,8443442678840,22076610372895, 53774915777897,123215084622184,267660712891040, 554792683762767] |