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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 1600 |
| 3 | 13683 |
| 4 | 84132 |
| 5 | 442089 |
| 6 | 2059793 |
| 7 | 8626382 |
| 8 | 32788075 |
| 9 | 114177368 |
| 10 | 367630559 |
| 11 | 1103854119 |
| 12 | 3114501259 |
| 13 | 8312578140 |
| 14 | 21108455323 |
| 15 | 51251494995 |
| 16 | 119493052710 |
| 17 | 268514504126 |
| 18 | 583406544627 |
| 19 | 1229033304669 |
| 20 | 2516545359868 |
| 21 | 5019124209561 |
[64,1600,13683,84132,442089,2059793,8626382, 32788075,114177368,367630559,1103854119, 3114501259,8312578140,21108455323,51251494995, 119493052710,268514504126,583406544627, 1229033304669,2516545359868,5019124209561] |