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| n | a(n) |
|---|---|
| 1 | 136 |
| 2 | 340 |
| 3 | 952 |
| 4 | 2884 |
| 5 | 9256 |
| 6 | 31060 |
| 7 | 107992 |
| 8 | 386404 |
| 9 | 1415176 |
| 10 | 5281780 |
| 11 | 20015032 |
| 12 | 76773124 |
| 13 | 297329896 |
| 14 | 1160228500 |
| 15 | 4554034072 |
| 16 | 17956283044 |
| 17 | 71047145416 |
| 18 | 281857767220 |
| 19 | 1120444917112 |
| 20 | 4460833796164 |
| 21 | 17780522733736 |
| 22 | 70933703913940 |
[136,340,952,2884,9256,31060,107992,386404, 1415176,5281780,20015032,76773124,297329896, 1160228500,4554034072,17956283044,71047145416, 281857767220,1120444917112,4460833796164, 17780522733736,70933703913940] |