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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 5 |
| 5 | 35 |
| 6 | 11 |
| 7 | 455 |
| 8 | 2645 |
| 9 | 32075 |
| 10 | 21689 |
| 11 | 904145 |
| 12 | 2158685 |
| 13 | 43508750 |
| 14 | 36780344 |
| 15 | 1476986472 |
| 16 | 2347455892 |
| 17 | 64539882234 |
| 18 | 62222755553 |
| 19 | 2415617534402 |
| 20 | 3140426826416 |
| 21 | 101999195453788 |
| 22 | 105327949061765 |
| 23 | 4032779888481758 |
[0,0,0,5,35,11,455,2645,32075,21689,904145, 2158685,43508750,36780344,1476986472,2347455892, 64539882234,62222755553,2415617534402, 3140426826416,101999195453788,105327949061765, 4032779888481758] |