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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 91 |
| 5 | 350 |
| 6 | 1437 |
| 7 | 5838 |
| 8 | 24751 |
| 9 | 104208 |
| 10 | 449389 |
| 11 | 1929971 |
| 12 | 8443469 |
| 13 | 36844202 |
| 14 | 162713469 |
| 15 | 717537441 |
| 16 | 3195215965 |
| 17 | 14217484796 |
| 18 | 63698045653 |
| 19 | 285299151193 |
| 20 | 1285224654333 |
| 21 | 5789830745442 |
| 22 | 26195024839731 |
| 23 | 118541037429530 |
| 24 | 538419893143561 |
| 25 | 2446426438959488 |
| 26 | 11147832144201953 |
| 27 | 50821066170962327 |
[1,2,7,23,91,350,1437,5838,24751,104208,449389, 1929971,8443469,36844202,162713469,717537441, 3195215965,14217484796,63698045653,285299151193, 1285224654333,5789830745442,26195024839731, 118541037429530,538419893143561,2446426438959488, 11147832144201953,50821066170962327] |