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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 480 |
| 3 | 1768 |
| 4 | 7388 |
| 5 | 29724 |
| 6 | 117084 |
| 7 | 468968 |
| 8 | 1878808 |
| 9 | 7493008 |
| 10 | 29925508 |
| 11 | 119605588 |
| 12 | 477741796 |
| 13 | 1908251600 |
| 14 | 7623408272 |
| 15 | 30453658424 |
| 16 | 121651754668 |
| 17 | 485967430220 |
| 18 | 1941313945708 |
| 19 | 7755000190904 |
| 20 | 30979095429960 |
| 21 | 123753089725152 |
[256,480,1768,7388,29724,117084,468968,1878808, 7493008,29925508,119605588,477741796,1908251600, 7623408272,30453658424,121651754668,485967430220, 1941313945708,7755000190904,30979095429960, 123753089725152] |