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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 35 |
| 4 | 301 |
| 5 | 2980 |
| 6 | 32824 |
| 7 | 394119 |
| 8 | 5089387 |
| 9 | 70008606 |
| 10 | 1018551386 |
| 11 | 15586572831 |
| 12 | 249761256325 |
| 13 | 4175639393112 |
| 14 | 72613795311014 |
| 15 | 1310044170067051 |
| 16 | 24465311302401475 |
| 17 | 472024733580022982 |
| 18 | 9392470260695334398 |
| 19 | 192455730876780393835 |
| 20 | 4055291189439769281557 |
[1,1,5,35,301,2980,32824,394119,5089387,70008606, 1018551386,15586572831,249761256325,4175639393112, 72613795311014,1310044170067051,24465311302401475, 472024733580022982,9392470260695334398, 192455730876780393835,4055291189439769281557] |