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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 20 |
| 3 | 41 |
| 4 | 73 |
| 5 | 149 |
| 6 | 372 |
| 7 | 861 |
| 8 | 2016 |
| 9 | 4901 |
| 10 | 11698 |
| 11 | 27986 |
| 12 | 67359 |
| 13 | 161518 |
| 14 | 387556 |
| 15 | 930666 |
| 16 | 2233451 |
| 17 | 5360842 |
| 18 | 12868595 |
| 19 | 30887501 |
| 20 | 74139733 |
| 21 | 177960357 |
| 22 | 427157604 |
| 23 | 1025312853 |
| 24 | 2461074852 |
| 25 | 5907342192 |
| 26 | 14179472548 |
| 27 | 34035173339 |
| 28 | 81695041734 |
[8,20,41,73,149,372,861,2016,4901,11698,27986, 67359,161518,387556,930666,2233451,5360842, 12868595,30887501,74139733,177960357,427157604, 1025312853,2461074852,5907342192,14179472548, 34035173339,81695041734] |