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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 41 |
| 5 | 159 |
| 6 | 688 |
| 7 | 2925 |
| 8 | 13046 |
| 9 | 58099 |
| 10 | 264647 |
| 11 | 1209007 |
| 12 | 5593147 |
| 13 | 25967563 |
| 14 | 121512931 |
| 15 | 570471691 |
| 16 | 2692588141 |
| 17 | 12744832317 |
| 18 | 60558719347 |
| 19 | 288445413396 |
| 20 | 1377905039968 |
| 21 | 6595712273761 |
| 22 | 31644526040701 |
| 23 | 152086731460280 |
| 24 | 732295734590892 |
| 25 | 3531261757118478 |
| 26 | 17054388743670055 |
| 27 | 82471187201160416 |
[1,1,3,10,41,159,688,2925,13046,58099,264647, 1209007,5593147,25967563,121512931,570471691, 2692588141,12744832317,60558719347,288445413396, 1377905039968,6595712273761,31644526040701, 152086731460280,732295734590892,3531261757118478, 17054388743670055,82471187201160416] |