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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 20 |
| 5 | 76 |
| 6 | 300 |
| 7 | 1189 |
| 8 | 4701 |
| 9 | 18754 |
| 10 | 75243 |
| 11 | 303407 |
| 12 | 1227560 |
| 13 | 4981002 |
| 14 | 20260788 |
| 15 | 82579632 |
| 16 | 337175123 |
| 17 | 1378826528 |
| 18 | 5646408697 |
| 19 | 23151632776 |
| 20 | 95034718893 |
| 21 | 390504864746 |
| 22 | 1606102645910 |
| 23 | 6611314522432 |
| 24 | 27235758104621 |
| 25 | 112279739875866 |
[1,2,6,20,76,300,1189,4701,18754,75243,303407, 1227560,4981002,20260788,82579632,337175123, 1378826528,5646408697,23151632776,95034718893, 390504864746,1606102645910,6611314522432, 27235758104621,112279739875866] |