| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 1 |
| 5 | 6 |
| 6 | 7 |
| 7 | 22 |
| 8 | 36 |
| 9 | 89 |
| 10 | 168 |
| 11 | 377 |
| 12 | 756 |
| 13 | 1630 |
| 14 | 3353 |
| 15 | 7110 |
| 16 | 14783 |
| 17 | 31130 |
| 18 | 65016 |
| 19 | 136513 |
| 20 | 285648 |
| 21 | 599041 |
| 22 | 1254456 |
| 23 | 2629418 |
| 24 | 5508097 |
| 25 | 11542854 |
| 26 | 24183271 |
| 27 | 50674318 |
| 28 | 106173180 |
| 29 | 222470009 |
| 30 | 466131960 |
| 31 | 976694489 |
| 32 | 2046447180 |
| 33 | 4287928678 |
| 34 | 8984443769 |
| 35 | 18825088134 |
[1,0,2,1,6,7,22,36,89,168,377,756,1630,3353,7110, 14783,31130,65016,136513,285648,599041,1254456, 2629418,5508097,11542854,24183271,50674318, 106173180,222470009,466131960,976694489, 2046447180,4287928678,8984443769,18825088134] |