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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 4 |
| 6 | 10 |
| 7 | 28 |
| 8 | 68 |
| 9 | 159 |
| 10 | 350 |
| 11 | 770 |
| 12 | 1642 |
| 13 | 3468 |
| 14 | 7218 |
| 15 | 14870 |
| 16 | 30463 |
| 17 | 62044 |
| 18 | 125818 |
| 19 | 254302 |
| 20 | 512690 |
| 21 | 1031284 |
| 22 | 2071858 |
| 23 | 4157214 |
| 24 | 8334742 |
| 25 | 16699103 |
| 26 | 33442208 |
| 27 | 66947772 |
| 28 | 133986940 |
| 29 | 268107104 |
| 30 | 536404872 |
| 31 | 1073082978 |
| 32 | 2146555516 |
| 33 | 4293665006 |
| 34 | 8588112822 |
[0,0,0,0,1,4,10,28,68,159,350,770,1642,3468,7218, 14870,30463,62044,125818,254302,512690,1031284, 2071858,4157214,8334742,16699103,33442208, 66947772,133986940,268107104,536404872,1073082978, 2146555516,4293665006,8588112822] |