The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 105 |
| 3 | 10395 |
| 4 | 2027025 |
| 5 | 654729075 |
| 6 | 316234143225 |
| 7 | 213458046676875 |
| 8 | 191898783962510625 |
| 9 | 221643095476699771875 |
| 10 | 319830986772877770815625 |
| 11 | 563862029680583509947946875 |
| 12 | 1192568192774434123539907640625 |
| 13 | 2980227913743310874726229193921875 |
[1,3,105,10395,2027025,654729075,316234143225, 213458046676875,191898783962510625, 221643095476699771875,319830986772877770815625, 563862029680583509947946875, 1192568192774434123539907640625, 2980227913743310874726229193921875] |