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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 280 |
| 4 | 1600 |
| 5 | 8985 |
| 6 | 50397 |
| 7 | 282332 |
| 8 | 1581428 |
| 9 | 8857677 |
| 10 | 49611209 |
| 11 | 277868792 |
| 12 | 1556321080 |
| 13 | 8716833601 |
| 14 | 48822302485 |
| 15 | 273449899316 |
| 16 | 1531571519964 |
| 17 | 8578212427349 |
| 18 | 48045897623297 |
| 19 | 269101318957392 |
| 20 | 1507215463960672 |
[7,49,280,1600,8985,50397,282332,1581428,8857677, 49611209,277868792,1556321080,8716833601, 48822302485,273449899316,1531571519964, 8578212427349,48045897623297,269101318957392, 1507215463960672] |