The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 500 |
| 3 | 7280 |
| 4 | 94416 |
| 5 | 1138368 |
| 6 | 13069120 |
| 7 | 144981760 |
| 8 | 1569049856 |
| 9 | 16674065408 |
| 10 | 174788490240 |
| 11 | 1813347594240 |
| 12 | 18663674269696 |
| 13 | 190917377179648 |
| 14 | 1943653403279360 |
| 15 | 19713779492126720 |
| 16 | 199364213335719936 |
[1,28,500,7280,94416,1138368,13069120,144981760, 1569049856,16674065408,174788490240,1813347594240, 18663674269696,190917377179648,1943653403279360, 19713779492126720,199364213335719936] |