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| n | a(n) |
|---|---|
| 53 | 1 |
| 54 | 54 |
| 55 | 1485 |
| 56 | 27720 |
| 57 | 395010 |
| 58 | 4582116 |
| 59 | 45057474 |
| 60 | 386206920 |
| 61 | 2944827765 |
| 62 | 20286591270 |
| 63 | 127805525001 |
| 64 | 743595781824 |
| 65 | 4027810484880 |
| 66 | 20448884000160 |
| 67 | 97862516286480 |
| 68 | 443643407165376 |
| 69 | 1913212193400684 |
| 70 | 7877932561061640 |
[1,54,1485,27720,395010,4582116,45057474, 386206920,2944827765,20286591270,127805525001, 743595781824,4027810484880,20448884000160, 97862516286480,443643407165376,1913212193400684, 7877932561061640] |