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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1120 |
| 3 | 5038 |
| 4 | 23838 |
| 5 | 115028 |
| 6 | 567446 |
| 7 | 2840760 |
| 8 | 14437142 |
| 9 | 74266834 |
| 10 | 386657722 |
| 11 | 2033497964 |
| 12 | 10798721926 |
| 13 | 57813989720 |
| 14 | 311880302990 |
| 15 | 1693057951386 |
| 16 | 9243577235114 |
| 17 | 50703873592100 |
| 18 | 279292256979166 |
| 19 | 1543652306971720 |
[256,1120,5038,23838,115028,567446,2840760, 14437142,74266834,386657722,2033497964, 10798721926,57813989720,311880302990, 1693057951386,9243577235114,50703873592100, 279292256979166,1543652306971720] |