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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 16 |
| 5 | 25 |
| 6 | 396 |
| 7 | 721 |
| 8 | 11264 |
| 9 | 46089 |
| 10 | 602200 |
| 11 | 3628801 |
| 12 | 133494912 |
| 13 | 479001601 |
| 14 | 7692266960 |
| 15 | 95904273375 |
| 16 | 1914926104576 |
| 17 | 20922789888001 |
| 18 | 628693317946656 |
| 19 | 6402373705728001 |
| 20 | 182635841123840000 |
| 21 | 2496321046987530021 |
| 22 | 55826951075231672512 |
| 23 | 1124000727777607680001 |
[1,1,2,3,16,25,396,721,11264,46089,602200,3628801, 133494912,479001601,7692266960,95904273375, 1914926104576,20922789888001,628693317946656, 6402373705728001,182635841123840000, 2496321046987530021,55826951075231672512, 1124000727777607680001] |