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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 6060 |
| 3 | 58776 |
| 4 | 358564 |
| 5 | 1649420 |
| 6 | 6286658 |
| 7 | 20984924 |
| 8 | 63558566 |
| 9 | 178909300 |
| 10 | 476033636 |
| 11 | 1212120160 |
| 12 | 2980927200 |
| 13 | 7129922604 |
| 14 | 16675350430 |
| 15 | 38293956836 |
| 16 | 86629645122 |
| 17 | 193553210580 |
| 18 | 427974677968 |
| 19 | 938053730248 |
| 20 | 2040792091884 |
| 21 | 4411561365324 |
| 22 | 9483844861978 |
[256,6060,58776,358564,1649420,6286658,20984924, 63558566,178909300,476033636,1212120160, 2980927200,7129922604,16675350430,38293956836, 86629645122,193553210580,427974677968, 938053730248,2040792091884,4411561365324, 9483844861978] |