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| n | a(n) |
|---|---|
| 1 | 26 |
| 2 | 114 |
| 3 | 480 |
| 4 | 2058 |
| 5 | 8812 |
| 6 | 37772 |
| 7 | 161906 |
| 8 | 694042 |
| 9 | 2975162 |
| 10 | 12753740 |
| 11 | 54671978 |
| 12 | 234364684 |
| 13 | 1004661088 |
| 14 | 4306723662 |
| 15 | 18461816670 |
| 16 | 79141059954 |
| 17 | 339257370296 |
| 18 | 1454309095546 |
| 19 | 6234249070708 |
| 20 | 26724622430876 |
| 21 | 114561583275826 |
[26,114,480,2058,8812,37772,161906,694042,2975162, 12753740,54671978,234364684,1004661088,4306723662, 18461816670,79141059954,339257370296, 1454309095546,6234249070708,26724622430876, 114561583275826] |