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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 10 |
| 3 | 54 |
| 4 | 408 |
| 5 | 3960 |
| 6 | 46800 |
| 7 | 650160 |
| 8 | 10362240 |
| 9 | 186157440 |
| 10 | 3719520000 |
| 11 | 81789523200 |
| 12 | 1962469555200 |
| 13 | 51017981414400 |
| 14 | 1428416301312000 |
| 15 | 42851181364992000 |
| 16 | 1371216880889856000 |
| 17 | 46621018262827008000 |
[2,3,10,54,408,3960,46800,650160,10362240, 186157440,3719520000,81789523200,1962469555200, 51017981414400,1428416301312000,42851181364992000, 1371216880889856000,46621018262827008000] |