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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 0 |
| 5 | 4 |
| 6 | 6 |
| 7 | 21 |
| 8 | 32 |
| 9 | 46 |
| 10 | 88 |
| 11 | 190 |
| 12 | 468 |
| 13 | 1046 |
| 14 | 2370 |
| 15 | 6015 |
| 16 | 12766 |
| 17 | 33972 |
| 18 | 81676 |
| 19 | 202255 |
| 20 | 504674 |
| 21 | 1275789 |
| 22 | 3206424 |
| 23 | 8249961 |
| 24 | 21031764 |
| 25 | 54337702 |
| 26 | 140377742 |
| 27 | 364430952 |
| 28 | 948642166 |
| 29 | 2473160606 |
| 30 | 6456496008 |
| 31 | 16874434634 |
[1,0,4,6,21,32,46,88,190,468,1046,2370,6015,12766, 33972,81676,202255,504674,1275789,3206424,8249961, 21031764,54337702,140377742,364430952,948642166, 2473160606,6456496008,16874434634] |