The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 8 |
| 7 | 15 |
| 8 | 29 |
| 9 | 57 |
| 10 | 112 |
| 11 | 220 |
| 12 | 432 |
| 13 | 848 |
| 14 | 1666 |
| 15 | 3273 |
| 16 | 6430 |
| 17 | 12632 |
| 18 | 24816 |
| 19 | 48754 |
| 20 | 95783 |
| 21 | 188177 |
| 22 | 369696 |
| 23 | 726312 |
| 24 | 1426930 |
| 25 | 2803381 |
| 26 | 5507590 |
| 27 | 10820345 |
| 28 | 21257915 |
| 29 | 41763825 |
| 30 | 82050242 |
| 31 | 161197933 |
| 32 | 316693445 |
| 33 | 622183778 |
| 34 | 1222357651 |
| 35 | 2401474098 |
| 36 | 4717995460 |
[1,1,1,2,4,8,15,29,57,112,220,432,848,1666,3273, 6430,12632,24816,48754,95783,188177,369696,726312, 1426930,2803381,5507590,10820345,21257915, 41763825,82050242,161197933,316693445,622183778, 1222357651,2401474098,4717995460] |