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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 55 |
| 3 | 935 |
| 4 | 21505 |
| 5 | 623645 |
| 6 | 21827575 |
| 7 | 894930575 |
| 8 | 42061737025 |
| 9 | 2229272062325 |
| 10 | 131527051677175 |
| 11 | 8549258359016375 |
| 12 | 606997343490162625 |
| 13 | 46738795448742522125 |
| 14 | 3879320022245629336375 |
| 15 | 345259481979861010937375 |
| 16 | 32799650788086796039050625 |
| 17 | 3312764729596766399944113125 |
[1,5,55,935,21505,623645,21827575,894930575, 42061737025,2229272062325,131527051677175, 8549258359016375,606997343490162625, 46738795448742522125,3879320022245629336375, 345259481979861010937375, 32799650788086796039050625, 3312764729596766399944113125] |