The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 152 |
| 4 | 4544 |
| 5 | 202176 |
| 6 | 10964160 |
| 7 | 1200365568 |
| 8 | 150015836160 |
| 9 | 27805483008000 |
| 10 | 5544972288000000 |
| 11 | 2072941756416000000 |
| 12 | 822928208560128000000 |
| 13 | 377355979957469184000000 |
| 14 | 177390712103372587008000000 |
| 15 | 138573172727437093502976000000 |
| 16 | 110847528189663694213349376000000 |
[1,8,152,4544,202176,10964160,1200365568, 150015836160,27805483008000,5544972288000000, 2072941756416000000,822928208560128000000, 377355979957469184000000, 177390712103372587008000000, 138573172727437093502976000000, 110847528189663694213349376000000] |