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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 88 |
| 3 | 281 |
| 4 | 1859 |
| 5 | 13246 |
| 6 | 63807 |
| 7 | 397689 |
| 8 | 2438053 |
| 9 | 13469845 |
| 10 | 81119250 |
| 11 | 479643334 |
| 12 | 2766405526 |
| 13 | 16398672521 |
| 14 | 96270399637 |
| 15 | 562412130699 |
| 16 | 3312658458361 |
| 17 | 19432125660759 |
| 18 | 113930244019306 |
| 19 | 669493281487815 |
| 20 | 3928178034671452 |
[7,88,281,1859,13246,63807,397689,2438053, 13469845,81119250,479643334,2766405526, 16398672521,96270399637,562412130699, 3312658458361,19432125660759,113930244019306, 669493281487815,3928178034671452] |