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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 22 |
| 3 | 42 |
| 4 | 80 |
| 5 | 140 |
| 6 | 254 |
| 7 | 448 |
| 8 | 820 |
| 9 | 1490 |
| 10 | 2788 |
| 11 | 5220 |
| 12 | 9974 |
| 13 | 19112 |
| 14 | 37100 |
| 15 | 72226 |
| 16 | 141724 |
| 17 | 278732 |
| 18 | 550774 |
| 19 | 1090128 |
| 20 | 2163668 |
| 21 | 4299314 |
| 22 | 8557076 |
| 23 | 17044564 |
| 24 | 33984118 |
| 25 | 67793624 |
| 26 | 135319900 |
| 27 | 270197826 |
| 28 | 539710892 |
| 29 | 1078295036 |
| 30 | 2154827702 |
| 31 | 4306766272 |
[8,22,42,80,140,254,448,820,1490,2788,5220,9974, 19112,37100,72226,141724,278732,550774,1090128, 2163668,4299314,8557076,17044564,33984118, 67793624,135319900,270197826,539710892,1078295036, 2154827702,4306766272] |