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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 33 |
| 3 | 245 |
| 4 | 1889 |
| 5 | 14725 |
| 6 | 115137 |
| 7 | 901045 |
| 8 | 7053121 |
| 9 | 55213445 |
| 10 | 432231393 |
| 11 | 3383685365 |
| 12 | 26488919969 |
| 13 | 207366548485 |
| 14 | 1623353845377 |
| 15 | 12708307129525 |
| 16 | 99486055923841 |
| 17 | 778819338036485 |
| 18 | 6096930429659553 |
| 19 | 47729375549975285 |
[1,5,33,245,1889,14725,115137,901045,7053121, 55213445,432231393,3383685365,26488919969, 207366548485,1623353845377,12708307129525, 99486055923841,778819338036485,6096930429659553, 47729375549975285] |