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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 18 |
| 4 | 147 |
| 5 | 1425 |
| 6 | 15855 |
| 7 | 200130 |
| 8 | 2838465 |
| 9 | 44767485 |
| 10 | 777046095 |
| 11 | 14705245170 |
| 12 | 301014595035 |
| 13 | 6621102973485 |
| 14 | 155640761791515 |
| 15 | 3891902825660850 |
| 16 | 103115436832433025 |
| 17 | 2884715829245475225 |
| 18 | 84950805438277854075 |
| 19 | 2626194012669689512050 |
[1,1,3,18,147,1425,15855,200130,2838465,44767485, 777046095,14705245170,301014595035,6621102973485, 155640761791515,3891902825660850, 103115436832433025,2884715829245475225, 84950805438277854075,2626194012669689512050] |