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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 16 |
| 4 | 182 |
| 5 | 2524 |
| 6 | 39992 |
| 7 | 699520 |
| 8 | 13231034 |
| 9 | 266985280 |
| 10 | 5694001172 |
| 11 | 127481465536 |
| 12 | 2981125793144 |
| 13 | 72532301230672 |
| 14 | 1830526849868000 |
| 15 | 47802726801684544 |
| 16 | 1289123410465365782 |
| 17 | 35841130838977837348 |
| 18 | 1025903099063974343984 |
| 19 | 30195807234087904770952 |
| 20 | 912951678159786641659796 |
| 21 | 28327442752528049524839856 |
| 22 | 901289532361030971832330544 |
| 23 | 29382621186595702051011638128 |
[1,2,16,182,2524,39992,699520,13231034,266985280, 5694001172,127481465536,2981125793144, 72532301230672,1830526849868000,47802726801684544, 1289123410465365782,35841130838977837348, 1025903099063974343984,30195807234087904770952, 912951678159786641659796, 28327442752528049524839856, 901289532361030971832330544, 29382621186595702051011638128] |