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| n | a(n) |
|---|---|
| 6 | 60 |
| 7 | 315 |
| 8 | 2268 |
| 9 | 14742 |
| 10 | 72180 |
| 11 | 464640 |
| 12 | 2676366 |
| 13 | 16400098 |
| 14 | 94209206 |
| 15 | 673282610 |
| 16 | 4095231104 |
| 17 | 29371828846 |
| 18 | 197547348216 |
| 19 | 1513916607683 |
| 20 | 10904464442572 |
| 21 | 87070803499372 |
| 22 | 673555061736062 |
| 23 | 5718121102062336 |
| 24 | 47028289679340734 |
| 25 | 418812093667530755 |
| 26 | 3680961843042545490 |
| 27 | 34161428275433710485 |
[60,315,2268,14742,72180,464640,2676366,16400098, 94209206,673282610,4095231104,29371828846, 197547348216,1513916607683,10904464442572, 87070803499372,673555061736062,5718121102062336, 47028289679340734,418812093667530755, 3680961843042545490,34161428275433710485] |