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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 8 |
| 3 | 116 |
| 4 | 220 |
| 5 | 3024 |
| 6 | 5724 |
| 7 | 78520 |
| 8 | 148616 |
| 9 | 2038508 |
| 10 | 3858304 |
| 11 | 52922700 |
| 12 | 100167300 |
| 13 | 1373951704 |
| 14 | 2600491508 |
| 15 | 35669821616 |
| 16 | 67512611920 |
| 17 | 926041410324 |
| 18 | 1752727418424 |
| 19 | 24041406846820 |
| 20 | 45503400267116 |
| 21 | 624150536607008 |
[0,4,8,116,220,3024,5724,78520,148616,2038508, 3858304,52922700,100167300,1373951704,2600491508, 35669821616,67512611920,926041410324, 1752727418424,24041406846820,45503400267116, 624150536607008] |