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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 313 |
| 5 | 5341 |
| 6 | 115651 |
| 7 | 3036517 |
| 8 | 93767185 |
| 9 | 3330162073 |
| 10 | 133737097411 |
| 11 | 5992748728561 |
| 12 | 296433923379529 |
| 13 | 16044427276953973 |
| 14 | 943207466055927619 |
| 15 | 59848531677741706621 |
| 16 | 4076826825898115406241 |
| 17 | 296742863575079244130225 |
[1,1,3,25,313,5341,115651,3036517,93767185, 3330162073,133737097411,5992748728561, 296433923379529,16044427276953973, 943207466055927619,59848531677741706621, 4076826825898115406241,296742863575079244130225] |