The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 13 |
| 5 | 33 |
| 6 | 78 |
| 7 | 186 |
| 8 | 436 |
| 9 | 1028 |
| 10 | 2394 |
| 11 | 5566 |
| 12 | 12877 |
| 13 | 29689 |
| 14 | 68198 |
| 15 | 156194 |
| 16 | 356599 |
| 17 | 811959 |
| 18 | 1843956 |
| 19 | 4177436 |
| 20 | 9442166 |
| 21 | 21295934 |
| 22 | 47932572 |
| 23 | 107677140 |
| 24 | 241443980 |
| 25 | 540441068 |
| 26 | 1207689636 |
| 27 | 2694452060 |
| 28 | 6002389882 |
| 29 | 13351958546 |
| 30 | 29659179804 |
| 31 | 65794744420 |
| 32 | 145768641091 |
[1,1,2,6,13,33,78,186,436,1028,2394,5566,12877, 29689,68198,156194,356599,811959,1843956,4177436, 9442166,21295934,47932572,107677140,241443980, 540441068,1207689636,2694452060,6002389882, 13351958546,29659179804,65794744420,145768641091] |