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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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 10 |
| 6 | 26 |
| 7 | 102 |
| 8 | 336 |
| 9 | 1225 |
| 10 | 4352 |
| 11 | 15934 |
| 12 | 58190 |
| 13 | 215250 |
| 14 | 798720 |
| 15 | 2983136 |
| 16 | 11184128 |
| 17 | 42109450 |
| 18 | 159070352 |
| 19 | 602809326 |
| 20 | 2290640486 |
| 21 | 8726307432 |
| 22 | 33318502400 |
| 23 | 127479700198 |
| 24 | 488671717040 |
| 25 | 1876500180280 |
| 26 | 7217306664960 |
| 27 | 27799998938929 |
| 28 | 107228560958610 |
| 29 | 414124108294450 |
[1,1,0,1,2,10,26,102,336,1225,4352,15934,58190, 215250,798720,2983136,11184128,42109450,159070352, 602809326,2290640486,8726307432,33318502400, 127479700198,488671717040,1876500180280, 7217306664960,27799998938929,107228560958610, 414124108294450] |