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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 1 |
| 9 | 17 |
| 10 | 71 |
| 11 | 368 |
| 12 | 1697 |
| 13 | 7769 |
| 14 | 34751 |
| 15 | 153313 |
| 16 | 668088 |
| 17 | 2882104 |
| 18 | 12329145 |
| 19 | 52358300 |
| 20 | 220901081 |
| 21 | 926638057 |
| 22 | 3867432363 |
| 23 | 16068748557 |
| 24 | 66495876593 |
| 25 | 274178902925 |
| 26 | 1126793986670 |
| 27 | 4616878543095 |
| 28 | 18864740697016 |
| 29 | 76885237242318 |
| 30 | 312611605360287 |
| 31 | 1268261191750753 |
[1,1,17,71,368,1697,7769,34751,153313,668088, 2882104,12329145,52358300,220901081,926638057, 3867432363,16068748557,66495876593,274178902925, 1126793986670,4616878543095,18864740697016, 76885237242318,312611605360287,1268261191750753] |