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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 29 |
| 6 | 230 |
| 7 | 1537 |
| 8 | 11208 |
| 9 | 89657 |
| 10 | 724755 |
| 11 | 6010150 |
| 12 | 55305521 |
| 13 | 545054759 |
| 14 | 5504044595 |
| 15 | 59482056555 |
| 16 | 690974195737 |
| 17 | 8306302563795 |
| 18 | 104653460921783 |
| 19 | 1401318441726295 |
| 20 | 19525683104731681 |
| 21 | 282626170020405627 |
| 22 | 4296152288224050974 |
| 23 | 67974610534037861728 |
[0,0,0,0,0,29,230,1537,11208,89657,724755,6010150, 55305521,545054759,5504044595,59482056555, 690974195737,8306302563795,104653460921783, 1401318441726295,19525683104731681, 282626170020405627,4296152288224050974, 67974610534037861728] |