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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 13 |
| 7 | 126 |
| 8 | 288 |
| 9 | 8160 |
| 10 | 110800 |
| 11 | 8552205 |
| 12 | 253822863 |
| 13 | 21802799690 |
| 14 | 1751958608840 |
| 15 | 231900341949104 |
| 16 | 8821242453833942 |
| 17 | 1943505339202134370 |
| 18 | 417503287597170065730 |
| 19 | 18004075657522393347770 |
| 20 | 7276527497090264178405240 |
| 21 | 2096206309349359523650043220 |
[0,0,0,0,1,13,126,288,8160,110800,8552205, 253822863,21802799690,1751958608840, 231900341949104,8821242453833942, 1943505339202134370,417503287597170065730, 18004075657522393347770,7276527497090264178405240, 2096206309349359523650043220] |