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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 16 |
| 3 | 49 |
| 4 | 169 |
| 5 | 676 |
| 6 | 2704 |
| 7 | 10609 |
| 8 | 42025 |
| 9 | 168100 |
| 10 | 672400 |
| 11 | 2686321 |
| 12 | 10738729 |
| 13 | 42954916 |
| 14 | 171819664 |
| 15 | 687226225 |
| 16 | 2748800041 |
| 17 | 10995200164 |
| 18 | 43980800656 |
| 19 | 175922363761 |
| 20 | 703687777321 |
| 21 | 2814751109284 |
| 22 | 11259004437136 |
| 23 | 45036004326769 |
[4,16,49,169,676,2704,10609,42025,168100,672400, 2686321,10738729,42954916,171819664,687226225, 2748800041,10995200164,43980800656,175922363761, 703687777321,2814751109284,11259004437136, 45036004326769] |