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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 0 |
| 8 | 2 |
| 9 | 4 |
| 10 | 9 |
| 11 | 20 |
| 12 | 45 |
| 13 | 98 |
| 14 | 210 |
| 15 | 453 |
| 16 | 971 |
| 17 | 2068 |
| 18 | 4387 |
| 19 | 9275 |
| 20 | 19545 |
| 21 | 41064 |
| 22 | 86055 |
| 23 | 179913 |
| 24 | 375338 |
| 25 | 781497 |
| 26 | 1624250 |
| 27 | 3370238 |
| 28 | 6982398 |
| 29 | 14445576 |
| 30 | 29846586 |
| 31 | 61591860 |
| 32 | 126956859 |
| 33 | 261411737 |
| 34 | 537723480 |
| 35 | 1105055809 |
| 36 | 2268948882 |
| 37 | 4654815069 |
| 38 | 9541957646 |
| 39 | 19545570684 |
[1,0,2,4,9,20,45,98,210,453,971,2068,4387,9275, 19545,41064,86055,179913,375338,781497,1624250, 3370238,6982398,14445576,29846586,61591860, 126956859,261411737,537723480,1105055809, 2268948882,4654815069,9541957646,19545570684] |