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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 34 |
| 5 | 126 |
| 6 | 491 |
| 7 | 1949 |
| 8 | 7919 |
| 9 | 32903 |
| 10 | 138223 |
| 11 | 587746 |
| 12 | 2526421 |
| 13 | 10941149 |
| 14 | 47729602 |
| 15 | 209562569 |
| 16 | 924878572 |
| 17 | 4101835581 |
| 18 | 18270356562 |
| 19 | 81686164214 |
| 20 | 366493225290 |
| 21 | 1649478891641 |
| 22 | 7444911031185 |
| 23 | 33690982426856 |
| 24 | 152831005271410 |
| 25 | 694817195153960 |
| 26 | 3165364902881297 |
| 27 | 14447917905401121 |
[1,1,3,10,34,126,491,1949,7919,32903,138223, 587746,2526421,10941149,47729602,209562569, 924878572,4101835581,18270356562,81686164214, 366493225290,1649478891641,7444911031185, 33690982426856,152831005271410,694817195153960, 3165364902881297,14447917905401121] |