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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 267 |
| 7 | 3470 |
| 8 | 43311 |
| 9 | 345834 |
| 10 | 2444098 |
| 11 | 13182592 |
| 12 | 64230756 |
| 13 | 260084531 |
| 14 | 976064810 |
| 15 | 3209275269 |
| 16 | 9963090038 |
| 17 | 27970062442 |
| 18 | 75278021479 |
| 19 | 187003944842 |
| 20 | 450006340740 |
| 21 | 1014913338398 |
| 22 | 2232744286681 |
| 23 | 4653016292419 |
| 24 | 9520091930911 |
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