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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 336 |
| 4 | 2275 |
| 5 | 15239 |
| 6 | 101192 |
| 7 | 667065 |
| 8 | 4370261 |
| 9 | 28480312 |
| 10 | 184750699 |
| 11 | 1193659551 |
| 12 | 7684815880 |
| 13 | 49319275649 |
| 14 | 315627565757 |
| 15 | 2014797616440 |
| 16 | 12831930191171 |
| 17 | 81554529162967 |
| 18 | 517343926505224 |
| 19 | 3276087952780041 |
| 20 | 20712766946115685 |
[7,49,336,2275,15239,101192,667065,4370261, 28480312,184750699,1193659551,7684815880, 49319275649,315627565757,2014797616440, 12831930191171,81554529162967,517343926505224, 3276087952780041,20712766946115685] |