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| n | a(n) |
|---|---|
| 2 | 5 |
| 3 | 29 |
| 4 | 104 |
| 5 | 1538 |
| 6 | 13842 |
| 7 | 188424 |
| 8 | 3249576 |
| 9 | 101864576 |
| 10 | 2388809736 |
| 11 | 59720243400 |
| 12 | 2571228006912 |
| 13 | 85266458294400 |
| 14 | 6038197537693842 |
| 15 | 227036227417289064 |
| 16 | 12129959730964036050 |
| 17 | 606111287080086323712 |
| 18 | 36186481977293685109248 |
[5,29,104,1538,13842,188424,3249576,101864576, 2388809736,59720243400,2571228006912, 85266458294400,6038197537693842, 227036227417289064,12129959730964036050, 606111287080086323712,36186481977293685109248] |