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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 70 |
| 4 | 863 |
| 5 | 13056 |
| 6 | 231187 |
| 7 | 4737986 |
| 8 | 109531991 |
| 9 | 2835638008 |
| 10 | 80950287311 |
| 11 | 2533758258912 |
| 12 | 86089196479255 |
| 13 | 3161596017956936 |
| 14 | 124590870125959343 |
| 15 | 5251666647713483356 |
| 16 | 235497961945975068767 |
| 17 | 11205025852314462333408 |
| 18 | 563351626162952600815087 |
| 19 | 29864689571162209608920060 |
| 20 | 1663796497123214306448307031 |
[1,7,70,863,13056,231187,4737986,109531991, 2835638008,80950287311,2533758258912, 86089196479255,3161596017956936, 124590870125959343,5251666647713483356, 235497961945975068767,11205025852314462333408, 563351626162952600815087, 29864689571162209608920060, 1663796497123214306448307031] |