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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 10 |
| 6 | 42 |
| 7 | 72 |
| 8 | 360 |
| 9 | 672 |
| 10 | 2160 |
| 11 | 3960 |
| 12 | 19488 |
| 13 | 30464 |
| 14 | 177840 |
| 15 | 356400 |
| 16 | 1201200 |
| 17 | 2096640 |
| 18 | 10967040 |
| 19 | 17510400 |
| 20 | 121176000 |
| 21 | 193564800 |
| 22 | 783455904 |
| 23 | 1324670976 |
| 24 | 8010737280 |
| 25 | 13121514000 |
| 26 | 50323046400 |
| 27 | 88690140000 |
| 28 | 274271961600 |
| 29 | 444141105408 |
| 30 | 2312335872000 |
[1,1,2,6,10,42,72,360,672,2160,3960,19488,30464, 177840,356400,1201200,2096640,10967040,17510400, 121176000,193564800,783455904,1324670976, 8010737280,13121514000,50323046400,88690140000, 274271961600,444141105408,2312335872000] |