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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 10 |
| 7 | 66 |
| 8 | 366 |
| 9 | 1851 |
| 10 | 8858 |
| 11 | 40890 |
| 12 | 184098 |
| 13 | 813948 |
| 14 | 3549758 |
| 15 | 15317294 |
| 16 | 65537334 |
| 17 | 278489619 |
| 18 | 1176688494 |
| 19 | 4948173294 |
| 20 | 20723897214 |
| 21 | 86494746204 |
| 22 | 359915608314 |
| 23 | 1493718226314 |
| 24 | 6184858989714 |
| 25 | 25556291840484 |
| 26 | 105406847513658 |
[1,10,66,366,1851,8858,40890,184098,813948, 3549758,15317294,65537334,278489619,1176688494, 4948173294,20723897214,86494746204,359915608314, 1493718226314,6184858989714,25556291840484, 105406847513658] |