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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 19 |
| 7 | 45 |
| 8 | 93 |
| 9 | 197 |
| 10 | 405 |
| 11 | 837 |
| 12 | 1697 |
| 13 | 3465 |
| 14 | 7011 |
| 15 | 14193 |
| 16 | 28653 |
| 17 | 57825 |
| 18 | 116471 |
| 19 | 234549 |
| 20 | 471801 |
| 21 | 948697 |
| 22 | 1906407 |
| 23 | 3829581 |
| 24 | 7689357 |
| 25 | 15435033 |
| 26 | 30973005 |
| 27 | 62137797 |
| 28 | 124630149 |
| 29 | 249922665 |
| 30 | 501078345 |
| 31 | 1004468157 |
| 32 | 2013263853 |
| 33 | 4034666121 |
| 34 | 8084640465 |
[0,0,1,3,9,19,45,93,197,405,837,1697,3465,7011, 14193,28653,57825,116471,234549,471801,948697, 1906407,3829581,7689357,15435033,30973005, 62137797,124630149,249922665,501078345,1004468157, 2013263853,4034666121,8084640465] |