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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 750 |
| 2 | 201375 |
| 3 | 22695250 |
| 4 | 998651625 |
| 5 | 26031517500 |
| 6 | 480182965250 |
| 7 | 6889530585750 |
| 8 | 81442044063750 |
| 9 | 824111047734000 |
| 10 | 7333504889261250 |
| 11 | 58541361200675250 |
| 12 | 425628799655493875 |
| 13 | 2852238724568034000 |
| 14 | 17785782442113552000 |
| 15 | 104010815310940347500 |
[1,750,201375,22695250,998651625,26031517500, 480182965250,6889530585750,81442044063750, 824111047734000,7333504889261250, 58541361200675250,425628799655493875, 2852238724568034000,17785782442113552000, 104010815310940347500] |