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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 | 0 |
| 2 | 2 |
| 3 | 2 |
| 4 | 12 |
| 5 | 20 |
| 6 | 96 |
| 7 | 212 |
| 8 | 898 |
| 9 | 2354 |
| 10 | 9266 |
| 11 | 27070 |
| 12 | 102094 |
| 13 | 319930 |
| 14 | 1177838 |
| 15 | 3865762 |
| 16 | 14050948 |
| 17 | 47574460 |
| 18 | 171886784 |
| 19 | 594572676 |
| 20 | 2143957648 |
| 21 | 7528825924 |
| 22 | 27156892364 |
| 23 | 96412294088 |
| 24 | 348314869652 |
| 25 | 1246689890248 |
| 26 | 4513958859208 |
| 27 | 16257651642036 |
| 28 | 59010423148052 |
| 29 | 213586733348928 |
[1,0,2,2,12,20,96,212,898,2354,9266,27070,102094, 319930,1177838,3865762,14050948,47574460, 171886784,594572676,2143957648,7528825924, 27156892364,96412294088,348314869652, 1246689890248,4513958859208,16257651642036, 59010423148052,213586733348928] |