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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 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 20 |
| 6 | 52 |
| 7 | 132 |
| 8 | 332 |
| 9 | 836 |
| 10 | 2108 |
| 11 | 5316 |
| 12 | 13404 |
| 13 | 33796 |
| 14 | 85212 |
| 15 | 214852 |
| 16 | 541724 |
| 17 | 1365892 |
| 18 | 3443932 |
| 19 | 8683460 |
| 20 | 21894300 |
| 21 | 55203844 |
| 22 | 139189852 |
| 23 | 350950468 |
| 24 | 884879388 |
| 25 | 2231116932 |
| 26 | 5625492956 |
| 27 | 14184003780 |
| 28 | 35763259292 |
| 29 | 90172756228 |
| 30 | 227359757660 |
[0,0,2,4,8,20,52,132,332,836,2108,5316,13404, 33796,85212,214852,541724,1365892,3443932,8683460, 21894300,55203844,139189852,350950468,884879388, 2231116932,5625492956,14184003780,35763259292, 90172756228,227359757660] |