The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 10 |
| 5 | 22 |
| 6 | 49 |
| 7 | 105 |
| 8 | 227 |
| 9 | 494 |
| 10 | 1071 |
| 11 | 2322 |
| 12 | 5038 |
| 13 | 10927 |
| 14 | 23699 |
| 15 | 51405 |
| 16 | 111498 |
| 17 | 241837 |
| 18 | 524546 |
| 19 | 1137742 |
| 20 | 2467761 |
| 21 | 5352577 |
| 22 | 11609747 |
| 23 | 25181550 |
| 24 | 54618807 |
| 25 | 118468250 |
| 26 | 256957750 |
| 27 | 557341615 |
| 28 | 1208874523 |
| 29 | 2622050045 |
| 30 | 5687229162 |
| 31 | 12335605733 |
| 32 | 26755941146 |
[1,1,2,5,10,22,49,105,227,494,1071,2322,5038, 10927,23699,51405,111498,241837,524546,1137742, 2467761,5352577,11609747,25181550,54618807, 118468250,256957750,557341615,1208874523, 2622050045,5687229162,12335605733,26755941146] |