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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 4 |
| 3 | 5 |
| 4 | 34 |
| 5 | 98 |
| 6 | 458 |
| 7 | 1703 |
| 8 | 7632 |
| 9 | 31222 |
| 10 | 139078 |
| 11 | 601834 |
| 12 | 2692054 |
| 13 | 12000298 |
| 14 | 54304846 |
| 15 | 246205555 |
| 16 | 1126480236 |
| 17 | 5170553126 |
| 18 | 23870651114 |
| 19 | 110597543652 |
| 20 | 514517316974 |
| 21 | 2401300629466 |
| 22 | 11243551419878 |
| 23 | 52789725198754 |
| 24 | 248514184071046 |
| 25 | 1172682575616138 |
| 26 | 5545963779654358 |
| 27 | 26282130844530698 |
[1,0,4,5,34,98,458,1703,7632,31222,139078,601834, 2692054,12000298,54304846,246205555,1126480236, 5170553126,23870651114,110597543652,514517316974, 2401300629466,11243551419878,52789725198754, 248514184071046,1172682575616138,5545963779654358, 26282130844530698] |