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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 31 |
| 4 | 155 |
| 5 | 767 |
| 6 | 3780 |
| 7 | 18595 |
| 8 | 91393 |
| 9 | 448981 |
| 10 | 2205125 |
| 11 | 10828709 |
| 12 | 53172183 |
| 13 | 261078623 |
| 14 | 1281874806 |
| 15 | 6293791663 |
| 16 | 30901142675 |
| 17 | 151716892649 |
| 18 | 744889168771 |
| 19 | 3657197145041 |
| 20 | 17955788884557 |
| 21 | 88157703490061 |
| 22 | 432828510306195 |
[1,6,31,155,767,3780,18595,91393,448981,2205125, 10828709,53172183,261078623,1281874806,6293791663, 30901142675,151716892649,744889168771, 3657197145041,17955788884557,88157703490061, 432828510306195] |