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| n | a(n) |
|---|---|
| 55 | 1 |
| 56 | 56 |
| 57 | 1596 |
| 58 | 30856 |
| 59 | 455126 |
| 60 | 5461512 |
| 61 | 55525372 |
| 62 | 491796152 |
| 63 | 3872894697 |
| 64 | 27540584512 |
| 65 | 179013799328 |
| 66 | 1074082795968 |
| 67 | 5996962277488 |
| 68 | 31368725759168 |
| 69 | 154603005527328 |
| 70 | 721480692460864 |
| 71 | 3201570572795084 |
| 72 | 13559593014190944 |
[1,56,1596,30856,455126,5461512,55525372, 491796152,3872894697,27540584512,179013799328, 1074082795968,5996962277488,31368725759168, 154603005527328,721480692460864,3201570572795084, 13559593014190944] |