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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 25 |
| 2 | 600 |
| 3 | 14400 |
| 4 | 345600 |
| 5 | 8294400 |
| 6 | 199065600 |
| 7 | 4777574400 |
| 8 | 114661785600 |
| 9 | 2751882854400 |
| 10 | 66045188505300 |
| 11 | 1585084524120000 |
| 12 | 38042028578707500 |
| 13 | 913008685884840000 |
| 14 | 21912208461136800000 |
| 15 | 525893003064898560000 |
[1,25,600,14400,345600,8294400,199065600, 4777574400,114661785600,2751882854400, 66045188505300,1585084524120000,38042028578707500, 913008685884840000,21912208461136800000, 525893003064898560000] |