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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 33 |
| 3 | 415 |
| 4 | 5198 |
| 5 | 49274 |
| 6 | 362191 |
| 7 | 2127283 |
| 8 | 10415371 |
| 9 | 43855201 |
| 10 | 162942160 |
| 11 | 544750425 |
| 12 | 1664602301 |
| 13 | 4706957039 |
| 14 | 12441105905 |
| 15 | 30990626912 |
| 16 | 73251661498 |
| 17 | 165232613947 |
| 18 | 357406368959 |
| 19 | 744394713024 |
| 20 | 1498152895495 |
| 21 | 2922476743386 |
| 22 | 5540491429760 |
| 23 | 10232097731194 |
[1,2,33,415,5198,49274,362191,2127283,10415371, 43855201,162942160,544750425,1664602301, 4706957039,12441105905,30990626912,73251661498, 165232613947,357406368959,744394713024, 1498152895495,2922476743386,5540491429760, 10232097731194] |