The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 14 |
| 6 | 30 |
| 7 | 62 |
| 8 | 133 |
| 9 | 275 |
| 10 | 562 |
| 11 | 1109 |
| 12 | 2145 |
| 13 | 4035 |
| 14 | 7457 |
| 15 | 13509 |
| 16 | 24115 |
| 17 | 42405 |
| 18 | 73667 |
| 19 | 126420 |
| 20 | 214681 |
| 21 | 360778 |
| 22 | 600625 |
| 23 | 990756 |
| 24 | 1620449 |
| 25 | 2628504 |
| 26 | 4230770 |
| 27 | 6758916 |
| 28 | 10721739 |
| 29 | 16892541 |
| 30 | 26443435 |
| 31 | 41137558 |
| 32 | 63618639 |
| 33 | 97825383 |
| 34 | 149605621 |
| 35 | 227593695 |
[0,1,3,7,14,30,62,133,275,562,1109,2145,4035,7457, 13509,24115,42405,73667,126420,214681,360778, 600625,990756,1620449,2628504,4230770,6758916, 10721739,16892541,26443435,41137558,63618639, 97825383,149605621,227593695] |