The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 4 |
| 3 | 1674 |
| 4 | 63062976 |
| 5 | 623360743125000 |
| 6 | 2670177736637149247308080 |
| 7 | 7363615666157189603982585462030330960 |
| 8 | 18165723931630806756964027928179555634194028453959680 |
| 9 | 53130688706387569792052442448845648519471103327391407016237759999637120 |
[0,0,4,1674,63062976,623360743125000, 2670177736637149247308080, 7363615666157189603982585462030330960, 18165723931630806756964027928179555634194028453959\ 680, 53130688706387569792052442448845648519471103327391\ 407016237759999637120] |