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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 8 |
| 3 | 25 |
| 4 | 59 |
| 5 | 331 |
| 6 | 883 |
| 7 | 3485 |
| 8 | 12030 |
| 9 | 43774 |
| 10 | 155664 |
| 11 | 540628 |
| 12 | 1936313 |
| 13 | 6871687 |
| 14 | 24471790 |
| 15 | 86551688 |
| 16 | 306708029 |
| 17 | 1089956129 |
| 18 | 3870392120 |
| 19 | 13733968845 |
| 20 | 48703981505 |
| 21 | 172844148554 |
| 22 | 613561265167 |
| 23 | 2177517194687 |
| 24 | 7726401450405 |
[2,8,25,59,331,883,3485,12030,43774,155664,540628, 1936313,6871687,24471790,86551688,306708029, 1089956129,3870392120,13733968845,48703981505, 172844148554,613561265167,2177517194687, 7726401450405] |