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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 | 1 |
| 3 | 6 |
| 4 | 19 |
| 5 | 61 |
| 6 | 240 |
| 7 | 769 |
| 8 | 2869 |
| 9 | 9774 |
| 10 | 34831 |
| 11 | 121969 |
| 12 | 428640 |
| 13 | 1509301 |
| 14 | 5297641 |
| 15 | 18644406 |
| 16 | 65502139 |
| 17 | 230343541 |
| 18 | 809678160 |
| 19 | 2846468089 |
| 20 | 10006911469 |
| 21 | 35178340254 |
| 22 | 123671565271 |
| 23 | 434760784009 |
| 24 | 1528407648960 |
| 25 | 5373087522061 |
[1,1,1,6,19,61,240,769,2869,9774,34831,121969, 428640,1509301,5297641,18644406,65502139, 230343541,809678160,2846468089,10006911469, 35178340254,123671565271,434760784009, 1528407648960,5373087522061] |