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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 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 58 |
| 5 | 580 |
| 6 | 7568 |
| 7 | 119448 |
| 8 | 2195772 |
| 9 | 46413792 |
| 10 | 1106667072 |
| 11 | 29403619080 |
| 12 | 861570383232 |
| 13 | 27600893313552 |
| 14 | 959793100481616 |
| 15 | 36006430081497120 |
| 16 | 1449539553826089360 |
| 17 | 62334045415459189248 |
| 18 | 2851721291051846833152 |
| 19 | 138299011223141244621024 |
[1,0,2,6,58,580,7568,119448,2195772,46413792, 1106667072,29403619080,861570383232, 27600893313552,959793100481616,36006430081497120, 1449539553826089360,62334045415459189248, 2851721291051846833152,138299011223141244621024] |