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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 22 |
| 5 | 52 |
| 6 | 117 |
| 7 | 260 |
| 8 | 565 |
| 9 | 1217 |
| 10 | 2593 |
| 11 | 5487 |
| 12 | 11538 |
| 13 | 24146 |
| 14 | 50316 |
| 15 | 104490 |
| 16 | 216337 |
| 17 | 446754 |
| 18 | 920506 |
| 19 | 1892904 |
| 20 | 3885719 |
| 21 | 7964162 |
| 22 | 16300646 |
| 23 | 33321640 |
| 24 | 68038796 |
| 25 | 138784403 |
| 26 | 282824924 |
| 27 | 575866839 |
| 28 | 1171612786 |
| 29 | 2381938742 |
| 30 | 4839331484 |
| 31 | 9825841526 |
| 32 | 19938975797 |
[0,1,3,9,22,52,117,260,565,1217,2593,5487,11538, 24146,50316,104490,216337,446754,920506,1892904, 3885719,7964162,16300646,33321640,68038796, 138784403,282824924,575866839,1171612786, 2381938742,4839331484,9825841526,19938975797] |