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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 10 |
| 5 | 42 |
| 6 | 194 |
| 7 | 979 |
| 8 | 5274 |
| 9 | 30037 |
| 10 | 179527 |
| 11 | 1120612 |
| 12 | 7280750 |
| 13 | 49120810 |
| 14 | 343547469 |
| 15 | 2487670468 |
| 16 | 18631824735 |
| 17 | 144215785791 |
| 18 | 1152745117570 |
| 19 | 9508011730755 |
| 20 | 80861962283808 |
| 21 | 708502494881786 |
| 22 | 6390084112199801 |
| 23 | 59272034375915217 |
| 24 | 564899767969587670 |
[1,1,1,3,10,42,194,979,5274,30037,179527,1120612, 7280750,49120810,343547469,2487670468,18631824735, 144215785791,1152745117570,9508011730755, 80861962283808,708502494881786,6390084112199801, 59272034375915217,564899767969587670] |