The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 13 |
| 6 | 24 |
| 7 | 43 |
| 8 | 82 |
| 9 | 151 |
| 10 | 285 |
| 11 | 535 |
| 12 | 1005 |
| 13 | 1883 |
| 14 | 3533 |
| 15 | 6631 |
| 16 | 12460 |
| 17 | 23407 |
| 18 | 43952 |
| 19 | 82538 |
| 20 | 154999 |
| 21 | 291088 |
| 22 | 546674 |
| 23 | 1026687 |
| 24 | 1928118 |
| 25 | 3621017 |
| 26 | 6800300 |
| 27 | 12771086 |
| 28 | 23984329 |
| 29 | 45042959 |
| 30 | 84591339 |
| 31 | 158863807 |
| 32 | 298348613 |
| 33 | 560303342 |
| 34 | 1052258402 |
| 35 | 1976157510 |
[1,1,2,4,7,13,24,43,82,151,285,535,1005,1883,3533, 6631,12460,23407,43952,82538,154999,291088,546674, 1026687,1928118,3621017,6800300,12771086,23984329, 45042959,84591339,158863807,298348613,560303342, 1052258402,1976157510] |