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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 398 |
| 5 | 3868 |
| 6 | 13796 |
| 7 | 31548 |
| 8 | 56952 |
| 9 | 89684 |
| 10 | 129637 |
| 11 | 176796 |
| 12 | 231161 |
| 13 | 292732 |
| 14 | 361509 |
| 15 | 437492 |
| 16 | 520681 |
| 17 | 611076 |
| 18 | 708677 |
| 19 | 813484 |
| 20 | 925497 |
| 21 | 1044716 |
| 22 | 1171141 |
| 23 | 1304772 |
| 24 | 1445609 |
| 25 | 1593652 |
| 26 | 1748901 |
| 27 | 1911356 |
| 28 | 2081017 |
| 29 | 2257884 |
| 30 | 2441957 |
| 31 | 2633236 |
[0,0,0,398,3868,13796,31548,56952,89684,129637, 176796,231161,292732,361509,437492,520681,611076, 708677,813484,925497,1044716,1171141,1304772, 1445609,1593652,1748901,1911356,2081017,2257884, 2441957,2633236] |