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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 104 |
| 2 | 1020 |
| 3 | 6092 |
| 4 | 26670 |
| 5 | 94128 |
| 6 | 283338 |
| 7 | 754380 |
| 8 | 1821534 |
| 9 | 4061200 |
[4,104,1020,6092,26670,94128,283338,754380, 1821534,4061200] |