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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 88 |
| 3 | 3056 |
| 4 | 319616 |
| 5 | 18940160 |
| 6 | 94645408768 |
| 7 | 526713485312 |
| 8 | 2012969145761792 |
| 9 | 1516106277997969408 |
| 10 | 950096677725742563328 |
| 11 | 125099579935028774699008 |
| 12 | 1308695886352702185064628224 |
| 13 | 7547869395875499805522264064 |
[1,2,88,3056,319616,18940160,94645408768, 526713485312,2012969145761792,1516106277997969408, 950096677725742563328,125099579935028774699008, 1308695886352702185064628224, 7547869395875499805522264064] |