The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 630 |
| 2 | 1385670 |
| 3 | 3528923580 |
| 4 | 9540949030470 |
| 5 | 26651569523959380 |
| 6 | 75998432812419471900 |
| 7 | 219813190240007470094520 |
| 8 | 642409325786050322446410310 |
| 9 | 1892390644737640220059489996260 |
[1,630,1385670,3528923580,9540949030470, 26651569523959380,75998432812419471900, 219813190240007470094520, 642409325786050322446410310, 1892390644737640220059489996260] |