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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 | 4 |
| 3 | 22 |
| 4 | 146 |
| 5 | 1131 |
| 6 | 10120 |
| 7 | 104015 |
| 8 | 1220957 |
| 9 | 16253289 |
| 10 | 243450538 |
| 11 | 4070466861 |
| 12 | 75393600728 |
| 13 | 1536160429870 |
| 14 | 34213493149270 |
| 15 | 828220957918213 |
| 16 | 21680478452572459 |
| 17 | 610911511290740374 |
| 18 | 18453811792850260925 |
[1,1,4,22,146,1131,10120,104015,1220957,16253289, 243450538,4070466861,75393600728,1536160429870, 34213493149270,828220957918213,21680478452572459, 610911511290740374,18453811792850260925] |