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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 51 |
| 3 | 782 |
| 4 | 15992 |
| 5 | 408814 |
| 6 | 12541010 |
| 7 | 448834728 |
| 8 | 18358297416 |
| 9 | 844755218400 |
| 10 | 43190363326992 |
| 11 | 2429044756967520 |
| 12 | 149029669269441456 |
| 13 | 9905401062535389072 |
| 14 | 709016063545908259248 |
| 15 | 54375505616232613595904 |
| 16 | 4448148376192382963462400 |
| 17 | 386619861956492109750650496 |
| 18 | 35580548688887294090357622912 |
[1,5,51,782,15992,408814,12541010,448834728, 18358297416,844755218400,43190363326992, 2429044756967520,149029669269441456, 9905401062535389072,709016063545908259248, 54375505616232613595904,4448148376192382963462400, 386619861956492109750650496, 35580548688887294090357622912] |