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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 | 2 |
| 2 | 0 |
| 3 | 2 |
| 4 | 12 |
| 5 | 24 |
| 6 | 28 |
| 7 | 120 |
| 8 | 480 |
| 9 | 1056 |
| 10 | 2304 |
| 11 | 8448 |
| 12 | 27760 |
| 13 | 69600 |
| 14 | 191232 |
| 15 | 643104 |
| 16 | 1978560 |
| 17 | 5470080 |
| 18 | 16353792 |
| 19 | 52557312 |
| 20 | 159694848 |
| 21 | 468853760 |
| 22 | 1444300800 |
| 23 | 4549644288 |
| 24 | 13905927936 |
| 25 | 42219904512 |
| 26 | 131505807360 |
| 27 | 411672307200 |
| 28 | 1270614647808 |
| 29 | 3928681875456 |
[1,2,0,2,12,24,28,120,480,1056,2304,8448,27760, 69600,191232,643104,1978560,5470080,16353792, 52557312,159694848,468853760,1444300800, 4549644288,13905927936,42219904512,131505807360, 411672307200,1270614647808,3928681875456] |