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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 | 2 |
| 2 | 4 |
| 3 | 13 |
| 4 | 45 |
| 5 | 293 |
| 6 | 1880 |
| 7 | 22810 |
| 8 | 274047 |
| 9 | 6160861 |
| 10 | 137419960 |
| 11 | 5755708030 |
| 12 | 238764714329 |
| 13 | 18607726818765 |
| 14 | 1436358552064865 |
| 15 | 208215628095796834 |
| 16 | 29898827223053355535 |
| 17 | 8063377147636346175953 |
| 18 | 2154023814255202610544411 |
[1,2,4,13,45,293,1880,22810,274047,6160861, 137419960,5755708030,238764714329,18607726818765, 1436358552064865,208215628095796834, 29898827223053355535,8063377147636346175953, 2154023814255202610544411] |