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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 33 |
| 3 | 164 |
| 4 | 811 |
| 5 | 4035 |
| 6 | 19997 |
| 7 | 99245 |
| 8 | 492401 |
| 9 | 2443097 |
| 10 | 12121712 |
| 11 | 60143345 |
| 12 | 298407987 |
| 13 | 1480586061 |
| 14 | 7346099129 |
| 15 | 36448521869 |
| 16 | 180843564461 |
| 17 | 897276298340 |
| 18 | 4451940313371 |
| 19 | 22088817679653 |
| 20 | 109596228179271 |
| 21 | 543774384192739 |
[7,33,164,811,4035,19997,99245,492401,2443097, 12121712,60143345,298407987,1480586061,7346099129, 36448521869,180843564461,897276298340, 4451940313371,22088817679653,109596228179271, 543774384192739] |