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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 42 |
| 5 | 145 |
| 6 | 602 |
| 7 | 2388 |
| 8 | 10042 |
| 9 | 42498 |
| 10 | 183049 |
| 11 | 799499 |
| 12 | 3524763 |
| 13 | 15688373 |
| 14 | 70431199 |
| 15 | 317977943 |
| 16 | 1446357299 |
| 17 | 6607070514 |
| 18 | 30349207627 |
| 19 | 139970939560 |
| 20 | 648077550792 |
| 21 | 3011857721135 |
| 22 | 14039719950122 |
| 23 | 65651502348997 |
| 24 | 307805927487748 |
| 25 | 1446796565404772 |
| 26 | 6816563009764308 |
| 27 | 32183644379465378 |
[1,1,4,10,42,145,602,2388,10042,42498,183049, 799499,3524763,15688373,70431199,317977943, 1446357299,6607070514,30349207627,139970939560, 648077550792,3011857721135,14039719950122, 65651502348997,307805927487748,1446796565404772, 6816563009764308,32183644379465378] |