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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 44 |
| 3 | 615 |
| 4 | 8568 |
| 5 | 119339 |
| 6 | 1662180 |
| 7 | 23151183 |
| 8 | 322454384 |
| 9 | 4491210195 |
| 10 | 62554488348 |
| 11 | 871271626679 |
| 12 | 12135248285160 |
| 13 | 169022204365563 |
| 14 | 2354175612832724 |
| 15 | 32789436375292575 |
| 16 | 456697933641263328 |
| 17 | 6360981634602394019 |
[0,3,44,615,8568,119339,1662180,23151183, 322454384,4491210195,62554488348,871271626679, 12135248285160,169022204365563,2354175612832724, 32789436375292575,456697933641263328, 6360981634602394019] |