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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 1 |
| 3 | 4 |
| 4 | 9 |
| 5 | 21 |
| 6 | 47 |
| 7 | 118 |
| 8 | 333 |
| 9 | 984 |
| 10 | 3362 |
| 11 | 12643 |
| 12 | 39490 |
| 13 | 98542 |
| 14 | 227138 |
| 15 | 581068 |
| 16 | 1805114 |
| 17 | 6540668 |
| 18 | 24406560 |
| 19 | 85426548 |
| 20 | 274421967 |
| 21 | 815755674 |
| 22 | 2293410096 |
| 23 | 6495970695 |
| 24 | 20483223847 |
| 25 | 74509476318 |
| 26 | 290215121856 |
| 27 | 1104108812114 |
| 28 | 3894326230239 |
[2,1,4,9,21,47,118,333,984,3362,12643,39490,98542, 227138,581068,1805114,6540668,24406560,85426548, 274421967,815755674,2293410096,6495970695, 20483223847,74509476318,290215121856, 1104108812114,3894326230239] |