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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 40 |
| 4 | 305 |
| 5 | 1622 |
| 6 | 6868 |
| 7 | 25036 |
| 8 | 82224 |
| 9 | 250208 |
| 10 | 718536 |
| 11 | 1972132 |
| 12 | 5220384 |
| 13 | 13417184 |
| 14 | 33652952 |
| 15 | 82699012 |
| 16 | 199729888 |
| 17 | 475260768 |
| 18 | 1116459752 |
| 19 | 2593550148 |
| 20 | 5965976992 |
| 21 | 13605076608 |
| 22 | 30787314104 |
| 23 | 69191005796 |
| 24 | 154539160288 |
| 25 | 343241755840 |
[3,40,305,1622,6868,25036,82224,250208,718536, 1972132,5220384,13417184,33652952,82699012, 199729888,475260768,1116459752,2593550148, 5965976992,13605076608,30787314104,69191005796, 154539160288,343241755840] |