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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1800 |
| 2 | 573680 |
| 3 | 71932472 |
| 4 | 4860312480 |
| 5 | 206974448552 |
| 6 | 6113629425680 |
| 7 | 133729976583000 |
| 8 | 2272306096926272 |
| 9 | 31109164150270280 |
| 10 | 353210385830106672 |
| 11 | 3404471043701699960 |
| 12 | 28398836335943882720 |
| 13 | 208343374455549585384 |
| 14 | 1362708897939788829520 |
| 15 | 8039392279542475239576 |
[1,1800,573680,71932472,4860312480,206974448552, 6113629425680,133729976583000,2272306096926272, 31109164150270280,353210385830106672, 3404471043701699960,28398836335943882720, 208343374455549585384,1362708897939788829520, 8039392279542475239576] |