The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 3 |
| 4 | 181 |
| 5 | 88028 |
| 6 | 21235051740 |
| 7 | 567915201450407862150 |
| 8 | 344114043575504570099838908555592732193828 |
| 9 | 2517587700386740093077985318903210991887701682095104296188806385635425261250603998340 |
[1,5,3,181,88028,21235051740, 567915201450407862150, 344114043575504570099838908555592732193828, 25175877003867400930779853189032109918877016820951\ 04296188806385635425261250603998340] |