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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 2 |
| 4 | 3 |
| 5 | 18 |
| 6 | 1382 |
| 7 | 12 |
| 8 | 32553 |
| 9 | 87734 |
| 10 | 1047666 |
| 11 | 2796588 |
| 12 | 1418184546 |
| 13 | 23685516 |
| 14 | 366420255876 |
| 15 | 13785346041608 |
| 16 | 23127963123651 |
| 17 | 2729316555918 |
| 18 | 52630543106106954746 |
| 19 | 1850522471899932 |
| 20 | 4699488932936084196918 |
| 21 | 18241171727016849632292 |
| 22 | 91090700441348806587348 |
[1,1,3,2,3,18,1382,12,32553,87734,1047666,2796588, 1418184546,23685516,366420255876,13785346041608, 23127963123651,2729316555918,52630543106106954746, 1850522471899932,4699488932936084196918, 18241171727016849632292,91090700441348806587348] |