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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 45 |
| 5 | 284 |
| 6 | 1570 |
| 7 | 10527 |
| 8 | 120589 |
| 9 | 1032992 |
| 10 | 13335366 |
| 11 | 182043905 |
| 12 | 2160966588 |
| 13 | 35883374045 |
| 14 | 563870609289 |
| 15 | 8657972073051 |
| 16 | 156350254702885 |
| 17 | 3047170542210952 |
| 18 | 55157193295047166 |
| 19 | 1048777885842926925 |
| 20 | 24322129996954683064 |
| 21 | 514342190008751240895 |
| 22 | 10665644686998892803631 |
[1,1,3,14,45,284,1570,10527,120589,1032992, 13335366,182043905,2160966588,35883374045, 563870609289,8657972073051,156350254702885, 3047170542210952,55157193295047166, 1048777885842926925,24322129996954683064, 514342190008751240895,10665644686998892803631] |