The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 14 |
| 4 | 27 |
| 5 | 58 |
| 6 | 109 |
| 7 | 216 |
| 8 | 402 |
| 9 | 760 |
| 10 | 1390 |
| 11 | 2550 |
| 12 | 4569 |
| 13 | 8178 |
| 14 | 14408 |
| 15 | 25280 |
| 16 | 43850 |
| 17 | 75685 |
| 18 | 129436 |
| 19 | 220226 |
| 20 | 371906 |
| 21 | 624840 |
| 22 | 1043178 |
| 23 | 1733108 |
| 24 | 2863422 |
| 25 | 4709222 |
| 26 | 7706800 |
| 27 | 12558213 |
| 28 | 20372860 |
| 29 | 32917707 |
| 30 | 52971756 |
| 31 | 84923643 |
| 32 | 135640660 |
| 33 | 215886778 |
| 34 | 342419132 |
[1,3,6,14,27,58,109,216,402,760,1390,2550,4569, 8178,14408,25280,43850,75685,129436,220226,371906, 624840,1043178,1733108,2863422,4709222,7706800, 12558213,20372860,32917707,52971756,84923643, 135640660,215886778,342419132] |