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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 | 3 |
| 2 | 9 |
| 3 | 19 |
| 4 | 49 |
| 5 | 123 |
| 6 | 297 |
| 7 | 707 |
| 8 | 1697 |
| 9 | 4043 |
| 10 | 9561 |
| 11 | 22547 |
| 12 | 53073 |
| 13 | 124571 |
| 14 | 291721 |
| 15 | 682083 |
| 16 | 1592577 |
| 17 | 3713643 |
| 18 | 8650425 |
| 19 | 20132275 |
| 20 | 46818225 |
| 21 | 108804923 |
| 22 | 252718825 |
| 23 | 586701827 |
| 24 | 1361496929 |
| 25 | 3158352139 |
| 26 | 7324384281 |
| 27 | 16981143379 |
| 28 | 39360789521 |
[1,3,9,19,49,123,297,707,1697,4043,9561,22547, 53073,124571,291721,682083,1592577,3713643, 8650425,20132275,46818225,108804923,252718825, 586701827,1361496929,3158352139,7324384281, 16981143379,39360789521] |