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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 33 |
| 4 | 282 |
| 5 | 2938 |
| 6 | 36029 |
| 7 | 507440 |
| 8 | 8058990 |
| 9 | 142315830 |
| 10 | 2763775025 |
| 11 | 58498072273 |
| 12 | 1339545500214 |
| 13 | 32980132065364 |
| 14 | 868417100538399 |
| 15 | 24344702489881998 |
| 16 | 723694354351500431 |
| 17 | 22733368105181643193 |
| 18 | 752291980101845144878 |
| 19 | 26153153055424960528533 |
[1,1,5,33,282,2938,36029,507440,8058990,142315830, 2763775025,58498072273,1339545500214, 32980132065364,868417100538399,24344702489881998, 723694354351500431,22733368105181643193, 752291980101845144878,26153153055424960528533] |