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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 800 |
| 2 | 500121600 |
| 3 | 6333406238720000 |
| 4 | 588750579021316096000000 |
| 5 | 243397196351152229173100544000000 |
| 6 | 331908261581281694863434866648678400000000 |
| 7 | 1223826698292228823742554320600270140080128000000000 |
| 8 | 10588007775487579454220040763957899854099800653824000000000000 |
[1,800,500121600,6333406238720000, 588750579021316096000000, 243397196351152229173100544000000, 331908261581281694863434866648678400000000, 12238266982922288237425543206002701400801280000000\ 00, 10588007775487579454220040763957899854099800653824\ 000000000000] |