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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 44 |
| 6 | 294 |
| 7 | 1728 |
| 8 | 13389 |
| 9 | 93130 |
| 10 | 796620 |
| 11 | 6235288 |
| 12 | 57551130 |
| 13 | 493813936 |
| 14 | 4857378920 |
| 15 | 44989814920 |
| 16 | 468103507718 |
| 17 | 4633862094852 |
| 18 | 50749496457992 |
| 19 | 533271010341720 |
| 20 | 6126256486912776 |
| 21 | 67990630238066888 |
| 22 | 817168635245112432 |
| 23 | 9541543704324657008 |
| 24 | 119719059789052412360 |
[1,1,2,10,44,294,1728,13389,93130,796620,6235288, 57551130,493813936,4857378920,44989814920, 468103507718,4633862094852,50749496457992, 533271010341720,6126256486912776, 67990630238066888,817168635245112432, 9541543704324657008,119719059789052412360] |