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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 111 |
| 6 | 612 |
| 7 | 3906 |
| 8 | 28701 |
| 9 | 236527 |
| 10 | 2167862 |
| 11 | 21824925 |
| 12 | 239861934 |
| 13 | 2854894485 |
| 14 | 36602472117 |
| 15 | 502718236303 |
| 16 | 7365503262033 |
| 17 | 114653301213668 |
| 18 | 1889769527067410 |
| 19 | 32877891905367530 |
| 20 | 602116339324675145 |
| 21 | 11578253045158664158 |
| 22 | 233244225298760907868 |
[1,1,2,6,24,111,612,3906,28701,236527,2167862, 21824925,239861934,2854894485,36602472117, 502718236303,7365503262033,114653301213668, 1889769527067410,32877891905367530, 602116339324675145,11578253045158664158, 233244225298760907868] |