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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 10 |
| 8 | 22 |
| 9 | 50 |
| 10 | 113 |
| 11 | 260 |
| 12 | 605 |
| 13 | 1418 |
| 14 | 3350 |
| 15 | 7967 |
| 16 | 19055 |
| 17 | 45810 |
| 18 | 110637 |
| 19 | 268301 |
| 20 | 653066 |
| 21 | 1594980 |
| 22 | 3907395 |
| 23 | 9599326 |
| 24 | 23643751 |
| 25 | 58374972 |
| 26 | 144442170 |
| 27 | 358136905 |
| 28 | 889671937 |
| 29 | 2214015802 |
| 30 | 5518884019 |
| 31 | 13778312440 |
| 32 | 34448765740 |
[1,0,0,1,1,2,5,10,22,50,113,260,605,1418,3350, 7967,19055,45810,110637,268301,653066,1594980, 3907395,9599326,23643751,58374972,144442170, 358136905,889671937,2214015802,5518884019, 13778312440,34448765740] |