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A198037 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 20 |
| 4 | 284 |
| 5 | 4771 |
| 6 | 199564 |
| 7 | 15833279 |
| 8 | 2206064568 |
| 9 | 659395510659 |
[1,5,20,284,4771,199564,15833279,2206064568, 659395510659] |