The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 22 |
| 4 | 53 |
| 5 | 162 |
| 6 | 526 |
| 7 | 1605 |
| 8 | 5011 |
| 9 | 15073 |
| 10 | 46562 |
| 11 | 143487 |
| 12 | 440836 |
| 13 | 1353988 |
| 14 | 4162099 |
| 15 | 12795741 |
| 16 | 39330623 |
| 17 | 120882310 |
| 18 | 371559669 |
| 19 | 1142099870 |
| 20 | 3510484802 |
| 21 | 10790188695 |
| 22 | 33166049781 |
| 23 | 101943428843 |
| 24 | 313345715556 |
| 25 | 963137000727 |
| 26 | 2960415365620 |
[1,9,22,53,162,526,1605,5011,15073,46562,143487, 440836,1353988,4162099,12795741,39330623, 120882310,371559669,1142099870,3510484802, 10790188695,33166049781,101943428843,313345715556, 963137000727,2960415365620] |