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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 4 |
| 4 | 54 |
| 5 | 918 |
| 6 | 31232 |
| 7 | 2059624 |
| 8 | 266734812 |
| 9 | 68574627036 |
| 10 | 35160753222400 |
| 11 | 36021330363615408 |
| 12 | 73782362964470935112 |
| 13 | 302225854825997535378632 |
| 14 | 2475866675779140063716682240 |
| 15 | 40564755806137338166417907530592 |
| 16 | 1329227401912999475682655581004557840 |
[0,4,54,918,31232,2059624,266734812,68574627036, 35160753222400,36021330363615408, 73782362964470935112,302225854825997535378632, 2475866675779140063716682240, 40564755806137338166417907530592, 1329227401912999475682655581004557840] |