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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 2304 |
| 3 | 367500 |
| 4 | 42467328 |
| 5 | 4381392020 |
| 6 | 428652000000 |
| 7 | 40643137651228 |
| 8 | 3771854305099776 |
| 9 | 344499209234302500 |
| 10 | 31074298464967845120 |
| 11 | 2774871814779003772844 |
| 12 | 245741556726521856000000 |
| 13 | 21611621448116558812137652 |
| 14 | 1889376666754339457990201088 |
| 15 | 164334311374716912516773437500 |
[4,2304,367500,42467328,4381392020,428652000000, 40643137651228,3771854305099776, 344499209234302500,31074298464967845120, 2774871814779003772844,245741556726521856000000, 21611621448116558812137652, 1889376666754339457990201088, 164334311374716912516773437500] |