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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 26 |
| 4 | 372 |
| 5 | 7424 |
| 6 | 190150 |
| 7 | 5946576 |
| 8 | 219643592 |
| 9 | 9357076704 |
| 10 | 451643892408 |
| 11 | 24359462797680 |
| 12 | 1451906224395792 |
| 13 | 94769186402062080 |
| 14 | 6723078079388867040 |
| 15 | 515064037555614081024 |
| 16 | 42380187502270667120640 |
| 17 | 3727409807764337879016960 |
[0,1,3,26,372,7424,190150,5946576,219643592, 9357076704,451643892408,24359462797680, 1451906224395792,94769186402062080, 6723078079388867040,515064037555614081024, 42380187502270667120640,3727409807764337879016960] |