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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 15 |
| 2 | 510 |
| 3 | 84240 |
| 4 | 69204960 |
| 5 | 284844384000 |
| 6 | 5892302096179200 |
| 7 | 613826012249992396800 |
| 8 | 322003239202740297793536000 |
| 9 | 850857971372280730568060043264000 |
| 10 | 11334246342025651164429104024534384640000 |
| 11 | 760681528794595483313206024106936185273712640000 |
[2,15,510,84240,69204960,284844384000, 5892302096179200,613826012249992396800, 322003239202740297793536000, 850857971372280730568060043264000, 11334246342025651164429104024534384640000, 760681528794595483313206024106936185273712640000] |