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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 37 |
| 3 | 153 |
| 4 | 475 |
| 5 | 1509 |
| 6 | 4763 |
| 7 | 15101 |
| 8 | 47889 |
| 9 | 151833 |
| 10 | 481519 |
| 11 | 1527001 |
| 12 | 4842421 |
| 13 | 15356565 |
| 14 | 48699233 |
| 15 | 154436377 |
| 16 | 489754155 |
| 17 | 1553125143 |
| 18 | 4925322519 |
| 19 | 15619350977 |
| 20 | 49532617623 |
| 21 | 157079520865 |
| 22 | 498135926335 |
| 23 | 1579705609759 |
| 24 | 5009616203811 |
[7,37,153,475,1509,4763,15101,47889,151833,481519, 1527001,4842421,15356565,48699233,154436377, 489754155,1553125143,4925322519,15619350977, 49532617623,157079520865,498135926335, 1579705609759,5009616203811] |