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A052850 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 5 |
| 3 | 20 |
| 4 | 114 |
| 5 | 864 |
| 6 | 8280 |
| 7 | 96480 |
| 8 | 1325520 |
| 9 | 20966400 |
| 10 | 374855040 |
| 11 | 7468070400 |
| 12 | 163938297600 |
| 13 | 3929729126400 |
| 14 | 102104460057600 |
| 15 | 2857878742118400 |
| 16 | 85719362496768000 |
| 17 | 2742726680838144000 |
| 18 | 93247371837075456000 |
| 19 | 3356802948155424768000 |
| 20 | 127556444063199191040000 |
[0,2,5,20,114,864,8280,96480,1325520,20966400, 374855040,7468070400,163938297600,3929729126400, 102104460057600,2857878742118400, 85719362496768000,2742726680838144000, 93247371837075456000,3356802948155424768000, 127556444063199191040000] |