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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 20 |
| 4 | 44 |
| 5 | 96 |
| 6 | 186 |
| 7 | 372 |
| 8 | 678 |
| 9 | 1252 |
| 10 | 2194 |
| 11 | 3884 |
| 12 | 6502 |
| 13 | 11102 |
| 14 | 18194 |
| 15 | 29966 |
| 16 | 47988 |
| 17 | 77300 |
| 18 | 121194 |
| 19 | 191132 |
| 20 | 294986 |
| 21 | 456368 |
| 22 | 694516 |
| 23 | 1058334 |
| 24 | 1588762 |
| 25 | 2388128 |
| 26 | 3545232 |
| 27 | 5263138 |
| 28 | 7733564 |
| 29 | 11356850 |
| 30 | 16526932 |
| 31 | 24036988 |
| 32 | 34684020 |
| 33 | 49989938 |
[1,3,8,20,44,96,186,372,678,1252,2194,3884,6502, 11102,18194,29966,47988,77300,121194,191132, 294986,456368,694516,1058334,1588762,2388128, 3545232,5263138,7733564,11356850,16526932, 24036988,34684020,49989938] |