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| n | a(n) |
|---|---|
| 4 | 4 |
| 5 | 20 |
| 6 | 144 |
| 7 | 1372 |
| 8 | 16384 |
| 9 | 236196 |
| 10 | 4000000 |
| 11 | 77948684 |
| 12 | 1719926784 |
| 13 | 42417997492 |
| 14 | 1157018619904 |
| 15 | 34599023437500 |
| 16 | 1125899906842624 |
| 17 | 39618312131623748 |
| 18 | 1499253470328324096 |
| 19 | 60724508119499193196 |
| 20 | 2621440000000000000000 |
| 21 | 120167769980326767578964 |
| 22 | 5829995856912430117421056 |
| 23 | 298461883710362842247633948 |
| 24 | 16079954871362414694843285504 |
[4,20,144,1372,16384,236196,4000000,77948684, 1719926784,42417997492,1157018619904, 34599023437500,1125899906842624,39618312131623748, 1499253470328324096,60724508119499193196, 2621440000000000000000,120167769980326767578964, 5829995856912430117421056, 298461883710362842247633948, 16079954871362414694843285504] |