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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 6 |
| 4 | 14 |
| 5 | 22 |
| 6 | 46 |
| 7 | 102 |
| 8 | 190 |
| 9 | 374 |
| 10 | 782 |
| 11 | 1542 |
| 12 | 3038 |
| 13 | 6166 |
| 14 | 12334 |
| 15 | 24486 |
| 16 | 49150 |
| 17 | 98486 |
| 18 | 196430 |
| 19 | 393030 |
| 20 | 786974 |
| 21 | 1572694 |
| 22 | 3144814 |
| 23 | 6292710 |
| 24 | 12583486 |
| 25 | 25162742 |
| 26 | 50333582 |
| 27 | 100667526 |
| 28 | 201318494 |
| 29 | 402652822 |
| 30 | 805322926 |
| 31 | 1610596902 |
| 32 | 3221208190 |
[2,2,6,14,22,46,102,190,374,782,1542,3038,6166, 12334,24486,49150,98486,196430,393030,786974, 1572694,3144814,6292710,12583486,25162742, 50333582,100667526,201318494,402652822,805322926, 1610596902,3221208190] |