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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 176 |
| 6 | 3145 |
| 7 | 22969 |
| 8 | 106819 |
| 9 | 376796 |
| 10 | 1101151 |
| 11 | 2805825 |
| 12 | 6438909 |
| 13 | 13602304 |
| 14 | 26866541 |
| 15 | 50186401 |
| 16 | 89436655 |
| 17 | 153088924 |
| 18 | 253052339 |
| 19 | 405702361 |
| 20 | 633123801 |
| 21 | 964595760 |
| 22 | 1438347889 |
| 23 | 2103619049 |
| 24 | 3023051131 |
| 25 | 4275452476 |
| 26 | 5958967015 |
| 27 | 8194686929 |
| 28 | 11130748309 |
[0,0,0,0,1,176,3145,22969,106819,376796,1101151, 2805825,6438909,13602304,26866541,50186401, 89436655,153088924,253052339,405702361,633123801, 964595760,1438347889,2103619049,3023051131, 4275452476,5958967015,8194686929,11130748309] |