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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 268 |
| 9 | 31356 |
| 10 | 2471008 |
| 11 | 156688950 |
| 12 | 8769288752 |
| 13 | 457164358716 |
| 14 | 22959079494036 |
| 15 | 1135195898868631 |
| 16 | 56066461542293032 |
| 17 | 2793059847097230456 |
| 18 | 141275485011659499936 |
| 19 | 7287917154352619470284 |
| 20 | 384587934464798917826784 |
| 21 | 20802129691800205763744280 |
| 22 | 1154767942465769017202459544 |
[1,268,31356,2471008,156688950,8769288752, 457164358716,22959079494036,1135195898868631, 56066461542293032,2793059847097230456, 141275485011659499936,7287917154352619470284, 384587934464798917826784, 20802129691800205763744280, 1154767942465769017202459544] |