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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 75 |
| 5 | 315 |
| 6 | 1343 |
| 7 | 5805 |
| 8 | 25469 |
| 9 | 112617 |
| 10 | 501885 |
| 11 | 2250049 |
| 12 | 10139301 |
| 13 | 45886365 |
| 14 | 208442445 |
| 15 | 949943279 |
| 16 | 4341663243 |
| 17 | 19894045759 |
| 18 | 91366143203 |
| 19 | 420480670439 |
| 20 | 1938759043735 |
| 21 | 8954642063739 |
| 22 | 41424603644035 |
| 23 | 191911504267863 |
| 24 | 890285766867387 |
| 25 | 4135254546142935 |
| 26 | 19230149489020755 |
| 27 | 89523642639196751 |
[1,1,5,19,75,315,1343,5805,25469,112617,501885, 2250049,10139301,45886365,208442445,949943279, 4341663243,19894045759,91366143203,420480670439, 1938759043735,8954642063739,41424603644035, 191911504267863,890285766867387,4135254546142935, 19230149489020755,89523642639196751] |