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| n | a(n) |
|---|---|
| 1 | 56 |
| 2 | 132 |
| 3 | 318 |
| 4 | 804 |
| 5 | 2048 |
| 6 | 5304 |
| 7 | 13786 |
| 8 | 36074 |
| 9 | 94630 |
| 10 | 249116 |
| 11 | 657120 |
| 12 | 1737412 |
| 13 | 4601434 |
| 14 | 12208078 |
| 15 | 32435606 |
| 16 | 86299392 |
| 17 | 229889712 |
| 18 | 613103960 |
| 19 | 1636797162 |
| 20 | 4373968322 |
| 21 | 11698648166 |
| 22 | 31314844564 |
| 23 | 83885825808 |
| 24 | 224868555948 |
[56,132,318,804,2048,5304,13786,36074,94630, 249116,657120,1737412,4601434,12208078,32435606, 86299392,229889712,613103960,1636797162, 4373968322,11698648166,31314844564,83885825808, 224868555948] |