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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 144 |
| 4 | 1024 |
| 5 | 6400 |
| 6 | 36864 |
| 7 | 200704 |
| 8 | 1048576 |
| 9 | 5308416 |
| 10 | 26214400 |
| 11 | 126877696 |
| 12 | 603979776 |
| 13 | 2835349504 |
| 14 | 13153337344 |
| 15 | 60397977600 |
| 16 | 274877906944 |
| 17 | 1241245548544 |
| 18 | 5566277615616 |
| 19 | 24807731101696 |
| 20 | 109951162777600 |
| 21 | 484884627849216 |
| 22 | 2128654511374336 |
| 23 | 9306266417496064 |
| 24 | 40532396646334464 |
[0,1,16,144,1024,6400,36864,200704,1048576, 5308416,26214400,126877696,603979776,2835349504, 13153337344,60397977600,274877906944, 1241245548544,5566277615616,24807731101696, 109951162777600,484884627849216,2128654511374336, 9306266417496064,40532396646334464] |