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| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 6972 |
| 3 | 261224 |
| 4 | 7092774 |
| 5 | 148688232 |
| 6 | 2503611964 |
| 7 | 34779531480 |
| 8 | 406309208481 |
| 9 | 4048627642976 |
| 10 | 34778882769216 |
| 11 | 259669578902016 |
| 12 | 1695618078654976 |
| 13 | 9726900031328256 |
| 14 | 49134911067979776 |
| 15 | 218511510918189056 |
| 16 | 852888183557922816 |
[120,6972,261224,7092774,148688232,2503611964, 34779531480,406309208481,4048627642976, 34778882769216,259669578902016,1695618078654976, 9726900031328256,49134911067979776, 218511510918189056,852888183557922816] |