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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 5 |
| 4 | 6 |
| 5 | 18 |
| 6 | 29 |
| 7 | 56 |
| 8 | 113 |
| 9 | 240 |
| 10 | 452 |
| 11 | 885 |
| 12 | 1790 |
| 13 | 3474 |
| 14 | 6951 |
| 15 | 13671 |
| 16 | 27183 |
| 17 | 54201 |
| 18 | 107224 |
| 19 | 213882 |
| 20 | 424513 |
| 21 | 845716 |
| 22 | 1682456 |
| 23 | 3350362 |
| 24 | 6671581 |
| 25 | 13299828 |
| 26 | 26500297 |
| 27 | 52829961 |
| 28 | 105342821 |
| 29 | 210088965 |
| 30 | 419106389 |
| 31 | 836097752 |
| 32 | 1668341390 |
| 33 | 3329412989 |
| 34 | 6645128078 |
[0,3,5,6,18,29,56,113,240,452,885,1790,3474,6951, 13671,27183,54201,107224,213882,424513,845716, 1682456,3350362,6671581,13299828,26500297, 52829961,105342821,210088965,419106389,836097752, 1668341390,3329412989,6645128078] |