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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 | 4 |
| 2 | 55 |
| 3 | 404 |
| 4 | 2462 |
| 5 | 11196 |
| 6 | 41135 |
| 7 | 122897 |
| 8 | 307319 |
| 9 | 652286 |
| 10 | 1199755 |
| 11 | 1950378 |
| 12 | 2885188 |
| 13 | 4043706 |
| 14 | 5718245 |
| 15 | 8888485 |
| 16 | 16594082 |
| 17 | 39074532 |
| 18 | 115646521 |
| 19 | 414852909 |
| 20 | 1714717418 |
| 21 | 7743579586 |
| 22 | 36521752030 |
| 23 | 174522348856 |
[1,4,55,404,2462,11196,41135,122897,307319,652286, 1199755,1950378,2885188,4043706,5718245,8888485, 16594082,39074532,115646521,414852909,1714717418, 7743579586,36521752030,174522348856] |