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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 28 |
| 3 | 162 |
| 4 | 268 |
| 5 | 596 |
| 6 | 1118 |
| 7 | 2166 |
| 8 | 4038 |
| 9 | 7488 |
| 10 | 13686 |
| 11 | 24818 |
| 12 | 44640 |
| 13 | 79796 |
| 14 | 141848 |
| 15 | 250966 |
| 16 | 442168 |
| 17 | 776152 |
| 18 | 1357850 |
| 19 | 2368298 |
| 20 | 4119186 |
[7,28,162,268,596,1118,2166,4038,7488,13686,24818, 44640,79796,141848,250966,442168,776152,1357850, 2368298,4119186] |