The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 54 |
| 4 | 3856 |
| 5 | 384375 |
| 6 | 52173801 |
| 7 | 9342271792 |
| 8 | 2144652558336 |
| 9 | 616093495529805 |
| 10 | 217007162119140625 |
| 11 | 92121505246667356416 |
| 12 | 46444033776765696086016 |
| 13 | 27459259766085858672714571 |
| 14 | 18830590227539089561714381425 |
| 15 | 14834398958231516437500000000000 |
[0,1,54,3856,384375,52173801,9342271792, 2144652558336,616093495529805,217007162119140625, 92121505246667356416,46444033776765696086016, 27459259766085858672714571, 18830590227539089561714381425, 14834398958231516437500000000000] |