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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 24 |
| 6 | 122 |
| 7 | 756 |
| 8 | 5532 |
| 9 | 46696 |
| 10 | 446748 |
| 11 | 4778004 |
| 12 | 56496384 |
| 13 | 731876160 |
| 14 | 10308645192 |
| 15 | 156862861920 |
| 16 | 2564468629464 |
| 17 | 44828643667200 |
| 18 | 834403045921936 |
| 19 | 16476039916372680 |
| 20 | 344000551441403460 |
| 21 | 7572120904973371152 |
| 22 | 175258231266231242316 |
| 23 | 4255020239957453122152 |
[1,1,2,6,24,122,756,5532,46696,446748,4778004, 56496384,731876160,10308645192,156862861920, 2564468629464,44828643667200,834403045921936, 16476039916372680,344000551441403460, 7572120904973371152,175258231266231242316, 4255020239957453122152] |