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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 28 |
| 4 | 76 |
| 5 | 182 |
| 6 | 406 |
| 7 | 868 |
| 8 | 1808 |
| 9 | 3706 |
| 10 | 7522 |
| 11 | 15176 |
| 12 | 30508 |
| 13 | 61198 |
| 14 | 122606 |
| 15 | 245452 |
| 16 | 491176 |
| 17 | 982658 |
| 18 | 1965658 |
| 19 | 3931696 |
| 20 | 7863812 |
| 21 | 15728086 |
| 22 | 31456678 |
| 23 | 62913908 |
| 24 | 125828416 |
| 25 | 251657482 |
| 26 | 503315666 |
| 27 | 1006632088 |
| 28 | 2013264988 |
| 29 | 4026530846 |
| 30 | 8053062622 |
| 31 | 16106126236 |
[1,8,28,76,182,406,868,1808,3706,7522,15176,30508, 61198,122606,245452,491176,982658,1965658,3931696, 7863812,15728086,31456678,62913908,125828416, 251657482,503315666,1006632088,2013264988, 4026530846,8053062622,16106126236] |