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| n | a(n) |
|---|---|
| 1 | 180 |
| 2 | 504 |
| 3 | 1148 |
| 4 | 2508 |
| 5 | 5202 |
| 6 | 10762 |
| 7 | 21622 |
| 8 | 43984 |
| 9 | 87406 |
| 10 | 177030 |
| 11 | 351096 |
| 12 | 711810 |
| 13 | 1414930 |
| 14 | 2878790 |
| 15 | 5747458 |
| 16 | 11748876 |
| 17 | 23580200 |
| 18 | 48449984 |
| 19 | 97774376 |
| 20 | 201923574 |
| 21 | 409657252 |
| 22 | 850120676 |
| 23 | 1733171824 |
| 24 | 3612646782 |
| 25 | 7397620764 |
| 26 | 15481145862 |
[180,504,1148,2508,5202,10762,21622,43984,87406, 177030,351096,711810,1414930,2878790,5747458, 11748876,23580200,48449984,97774376,201923574, 409657252,850120676,1733171824,3612646782, 7397620764,15481145862] |