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| n | a(n) |
|---|---|
| 0 | 7 |
| 1 | 47 |
| 2 | 287 |
| 3 | 1727 |
| 4 | 10367 |
| 5 | 62207 |
| 6 | 373247 |
| 7 | 2239487 |
| 8 | 13436927 |
| 9 | 80621567 |
| 10 | 483729407 |
| 11 | 2902376447 |
| 12 | 17414258687 |
| 13 | 104485552127 |
| 14 | 626913312767 |
| 15 | 3761479876607 |
| 16 | 22568879259647 |
| 17 | 135413275557887 |
| 18 | 812479653347327 |
| 19 | 4874877920083967 |
| 20 | 29249267520503807 |
[7,47,287,1727,10367,62207,373247,2239487, 13436927,80621567,483729407,2902376447, 17414258687,104485552127,626913312767, 3761479876607,22568879259647,135413275557887, 812479653347327,4874877920083967, 29249267520503807] |