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A211877 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 673 |
| 4 | 102273 |
| 5 | 47663617 |
| 6 | 110981851137 |
| 7 | 815432848809985 |
| 8 | 30052835284679819265 |
| 9 | 3519512226295269640765441 |
| 10 | 2069751512310185039905834926081 |
| 11 | 3874510079394593253089862950754189313 |
| 12 | 36431456010689490638771956423547489198538753 |
[1,21,673,102273,47663617,110981851137, 815432848809985,30052835284679819265, 3519512226295269640765441, 2069751512310185039905834926081, 3874510079394593253089862950754189313, 36431456010689490638771956423547489198538753] |