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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 44 |
| 5 | 80 |
| 6 | 912 |
| 7 | 448 |
| 8 | 41344 |
| 9 | 62784 |
| 10 | 2424320 |
| 11 | 11264 |
| 12 | 319358976 |
| 13 | 53248 |
| 14 | 11623886848 |
| 15 | 435891701760 |
| 16 | 1801685209088 |
| 17 | 1114112 |
| 18 | 1504049698308096 |
| 19 | 4980736 |
| 20 | 210465332463861760 |
| 21 | 5676771352434180096 |
| 22 | 792945839748153344 |
| 23 | 96468992 |
| 24 | 79367059219950565588992 |
[1,4,12,44,80,912,448,41344,62784,2424320,11264, 319358976,53248,11623886848,435891701760, 1801685209088,1114112,1504049698308096,4980736, 210465332463861760,5676771352434180096, 792945839748153344,96468992, 79367059219950565588992] |