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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 | 60 |
| 3 | 960 |
| 4 | 30780 |
| 5 | 996480 |
| 6 | 36560400 |
| 7 | 1430553600 |
| 8 | 59089923900 |
| 9 | 2543035488000 |
| 10 | 113129280527760 |
| 11 | 5170796720812800 |
| 12 | 241741903350301200 |
| 13 | 11520044551208793600 |
| 14 | 558061378022616811200 |
| 15 | 27421336248833005839360 |
[1,0,60,960,30780,996480,36560400,1430553600, 59089923900,2543035488000,113129280527760, 5170796720812800,241741903350301200, 11520044551208793600,558061378022616811200, 27421336248833005839360] |