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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 44 |
| 3 | 4410 |
| 4 | 905840 |
| 5 | 318906400 |
| 6 | 172185088824 |
| 7 | 132357574570221 |
| 8 | 137406570363495360 |
| 9 | 185242628827767255255 |
| 10 | 314645673306845990409300 |
| 11 | 657405676947400829561901359 |
| 12 | 1656968286301847988118098735168 |
| 13 | 4957425610652588047512198547937050 |
[1,1,44,4410,905840,318906400,172185088824, 132357574570221,137406570363495360, 185242628827767255255,314645673306845990409300, 657405676947400829561901359, 1656968286301847988118098735168, 4957425610652588047512198547937050] |