The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 196 |
| 3 | 75272 |
| 4 | 599466256 |
| 5 | 28838245503008 |
| 6 | 22463213552677201984 |
| 7 | 123818965842734619629420672 |
| 8 | 9830731407624872890044690474098944 |
| 9 | 6011432546485776316904414215762657381908992 |
[1,2,196,75272,599466256,28838245503008, 22463213552677201984,123818965842734619629420672, 9830731407624872890044690474098944, 6011432546485776316904414215762657381908992] |