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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 55 |
| 6 | 159 |
| 7 | 471 |
| 8 | 1403 |
| 9 | 4191 |
| 10 | 12551 |
| 11 | 37615 |
| 12 | 112787 |
| 13 | 338279 |
| 14 | 1014703 |
| 15 | 3043911 |
| 16 | 9131435 |
| 17 | 27393839 |
| 18 | 82180823 |
| 19 | 246541407 |
| 20 | 739622595 |
| 21 | 2218865335 |
| 22 | 6656592255 |
| 23 | 19969771063 |
| 24 | 59909304539 |
| 25 | 179727900415 |
| 26 | 539183681191 |
| 27 | 1617551013071 |
| 28 | 4852652992755 |
| 29 | 14557958907655 |
| 30 | 43673876615503 |
[0,1,3,7,19,55,159,471,1403,4191,12551,37615, 112787,338279,1014703,3043911,9131435,27393839, 82180823,246541407,739622595,2218865335, 6656592255,19969771063,59909304539,179727900415, 539183681191,1617551013071,4852652992755, 14557958907655,43673876615503] |