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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 28 |
| 3 | 106 |
| 4 | 388 |
| 5 | 1387 |
| 6 | 4874 |
| 7 | 16919 |
| 8 | 58198 |
| 9 | 198807 |
| 10 | 675372 |
| 11 | 2283994 |
| 12 | 7695280 |
| 13 | 25845198 |
| 14 | 86568033 |
| 15 | 289279804 |
| 16 | 964690182 |
| 17 | 3211220933 |
| 18 | 10672137362 |
| 19 | 35416362298 |
| 20 | 117378654202 |
| 21 | 388561273645 |
| 22 | 1284874248757 |
| 23 | 4244554964082 |
[7,28,106,388,1387,4874,16919,58198,198807,675372, 2283994,7695280,25845198,86568033,289279804, 964690182,3211220933,10672137362,35416362298, 117378654202,388561273645,1284874248757, 4244554964082] |