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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 72 |
| 4 | 2608 |
| 5 | 272752 |
| 6 | 93847104 |
| 7 | 110518842048 |
| 8 | 454710381676032 |
| 9 | 6640565658505128832 |
| 10 | 348708024629593894001152 |
| 11 | 66538376166308068986316241408 |
| 12 | 46534722991725338264882258863095808 |
| 13 | 120139253095727581744381043433138973706240 |
| 14 | 1151909524447243687554850690730124812494959992832 |
[0,4,72,2608,272752,93847104,110518842048, 454710381676032,6640565658505128832, 348708024629593894001152, 66538376166308068986316241408, 46534722991725338264882258863095808, 120139253095727581744381043433138973706240, 1151909524447243687554850690730124812494959992832] |