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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 5 |
| 8 | 11 |
| 9 | 19 |
| 10 | 32 |
| 11 | 60 |
| 12 | 178 |
| 13 | 612 |
| 14 | 1910 |
| 15 | 6505 |
| 16 | 22097 |
| 17 | 62717 |
| 18 | 155341 |
| 19 | 365413 |
| 20 | 908850 |
| 21 | 2587326 |
| 22 | 8337462 |
| 23 | 28613490 |
| 24 | 99865122 |
| 25 | 341887279 |
| 26 | 1112148217 |
| 27 | 3385839203 |
| 28 | 9723179369 |
| 29 | 27116765041 |
| 30 | 76656520298 |
| 31 | 228493968174 |
| 32 | 728697760582 |
| 33 | 2447359432110 |
[1,0,0,0,0,1,1,5,11,19,32,60,178,612,1910,6505, 22097,62717,155341,365413,908850,2587326,8337462, 28613490,99865122,341887279,1112148217,3385839203, 9723179369,27116765041,76656520298,228493968174, 728697760582,2447359432110] |