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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 29 |
| 3 | 125 |
| 4 | 543 |
| 5 | 2363 |
| 6 | 10287 |
| 7 | 44787 |
| 8 | 194995 |
| 9 | 848979 |
| 10 | 3696331 |
| 11 | 16093291 |
| 12 | 70067867 |
| 13 | 305065387 |
| 14 | 1328210699 |
| 15 | 5782837835 |
| 16 | 25177641963 |
| 17 | 109619822123 |
| 18 | 477268896747 |
| 19 | 2077959947307 |
| 20 | 9047137938475 |
| 21 | 39389933855019 |
[1,7,29,125,543,2363,10287,44787,194995,848979, 3696331,16093291,70067867,305065387,1328210699, 5782837835,25177641963,109619822123,477268896747, 2077959947307,9047137938475,39389933855019] |