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| n | a(n) |
|---|---|
| 1 | 308 |
| 2 | 1540 |
| 3 | 7348 |
| 4 | 38424 |
| 5 | 190188 |
| 6 | 1029224 |
| 7 | 5219076 |
| 8 | 28931288 |
| 9 | 148987468 |
| 10 | 838864504 |
| 11 | 4360734660 |
| 12 | 24788769080 |
| 13 | 129580167628 |
| 14 | 740795388728 |
| 15 | 3884928235332 |
| 16 | 22283140973496 |
| 17 | 117075211006540 |
| 18 | 672795456240696 |
| 19 | 3538587841442884 |
[308,1540,7348,38424,190188,1029224,5219076, 28931288,148987468,838864504,4360734660, 24788769080,129580167628,740795388728, 3884928235332,22283140973496,117075211006540, 672795456240696,3538587841442884] |