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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 35 |
| 4 | 561 |
| 5 | 14532 |
| 6 | 558426 |
| 7 | 29947185 |
| 8 | 2141867440 |
| 9 | 197304236151 |
| 10 | 22773405820375 |
| 11 | 3221070321954212 |
| 12 | 548135428211610344 |
| 13 | 110514990079832223628 |
| 14 | 26057791266228066121614 |
| 15 | 7105134240266115177248187 |
| 16 | 2218719629100693497237788887 |
| 17 | 786736247267010426995743418575 |
[1,1,4,35,561,14532,558426,29947185,2141867440, 197304236151,22773405820375,3221070321954212, 548135428211610344,110514990079832223628, 26057791266228066121614,7105134240266115177248187, 2218719629100693497237788887, 786736247267010426995743418575] |