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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 14 |
| 4 | 46 |
| 5 | 134 |
| 6 | 502 |
| 7 | 1820 |
| 8 | 5980 |
| 9 | 23198 |
| 10 | 87922 |
| 11 | 306836 |
| 12 | 1216060 |
| 13 | 4729934 |
| 14 | 17121082 |
| 15 | 68851202 |
| 16 | 272448226 |
| 17 | 1010816594 |
| 18 | 4108318162 |
| 19 | 16458898196 |
| 20 | 62164300252 |
| 21 | 254714419202 |
| 22 | 1030026465334 |
| 23 | 3943455360182 |
| 24 | 16261959193558 |
| 25 | 66245444855966 |
| 26 | 256342162541710 |
| 27 | 1062615874236728 |
| 28 | 4354486276936816 |
[1,2,4,14,46,134,502,1820,5980,23198,87922,306836, 1216060,4729934,17121082,68851202,272448226, 1010816594,4108318162,16458898196,62164300252, 254714419202,1030026465334,3943455360182, 16261959193558,66245444855966,256342162541710, 1062615874236728,4354486276936816] |