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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 22 |
| 5 | 48 |
| 6 | 104 |
| 7 | 220 |
| 8 | 460 |
| 9 | 954 |
| 10 | 1956 |
| 11 | 3976 |
| 12 | 8026 |
| 13 | 16084 |
| 14 | 32032 |
| 15 | 63440 |
| 16 | 124974 |
| 17 | 245008 |
| 18 | 478204 |
| 19 | 929452 |
| 20 | 1799508 |
| 21 | 3471396 |
| 22 | 6673724 |
| 23 | 12788976 |
| 24 | 24433528 |
| 25 | 46546738 |
| 26 | 88432264 |
| 27 | 167575474 |
| 28 | 316768948 |
| 29 | 597389576 |
| 30 | 1124092476 |
| 31 | 2110661644 |
| 32 | 3955006820 |
| 33 | 7396477224 |
[1,2,4,10,22,48,104,220,460,954,1956,3976,8026, 16084,32032,63440,124974,245008,478204,929452, 1799508,3471396,6673724,12788976,24433528, 46546738,88432264,167575474,316768948,597389576, 1124092476,2110661644,3955006820,7396477224] |