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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 8 |
| 5 | 22 |
| 6 | 46 |
| 7 | 98 |
| 8 | 210 |
| 9 | 430 |
| 10 | 886 |
| 11 | 1790 |
| 12 | 3638 |
| 13 | 7350 |
| 14 | 14830 |
| 15 | 29758 |
| 16 | 59802 |
| 17 | 119802 |
| 18 | 240362 |
| 19 | 480966 |
| 20 | 963302 |
| 21 | 1927382 |
| 22 | 3857746 |
| 23 | 7715446 |
| 24 | 15437078 |
| 25 | 30873042 |
| 26 | 61759618 |
| 27 | 123512490 |
| 28 | 247051278 |
| 29 | 494077866 |
| 30 | 988213906 |
| 31 | 1976359510 |
| 32 | 3952834998 |
| 33 | 7905474522 |
| 34 | 15811215542 |
| 35 | 31621940822 |
| 36 | 63244422558 |
[0,0,2,8,22,46,98,210,430,886,1790,3638,7350, 14830,29758,59802,119802,240362,480966,963302, 1927382,3857746,7715446,15437078,30873042, 61759618,123512490,247051278,494077866,988213906, 1976359510,3952834998,7905474522,15811215542, 31621940822,63244422558] |