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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 | 2 |
| 3 | 6 |
| 4 | 18 |
| 5 | 61 |
| 6 | 220 |
| 7 | 822 |
| 8 | 3157 |
| 9 | 12378 |
| 10 | 49345 |
| 11 | 199441 |
| 12 | 815467 |
| 13 | 3367153 |
| 14 | 14020938 |
| 15 | 58811032 |
| 16 | 248260925 |
| 17 | 1053893607 |
| 18 | 4496248445 |
| 19 | 19268100048 |
| 20 | 82902438819 |
| 21 | 357987967157 |
| 22 | 1550951132419 |
| 23 | 6739554074740 |
| 24 | 29366902576469 |
| 25 | 128287060703669 |
[1,1,2,6,18,61,220,822,3157,12378,49345,199441, 815467,3367153,14020938,58811032,248260925, 1053893607,4496248445,19268100048,82902438819, 357987967157,1550951132419,6739554074740, 29366902576469,128287060703669] |