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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 16 |
| 4 | 47 |
| 5 | 154 |
| 6 | 496 |
| 7 | 1601 |
| 8 | 5183 |
| 9 | 16777 |
| 10 | 54298 |
| 11 | 175777 |
| 12 | 569008 |
| 13 | 1841952 |
| 14 | 5962675 |
| 15 | 19302067 |
| 16 | 62483633 |
| 17 | 202268864 |
| 18 | 654774451 |
| 19 | 2119602518 |
| 20 | 6861469468 |
| 21 | 22211599969 |
| 22 | 71902261547 |
| 23 | 232758343993 |
| 24 | 753473472226 |
| 25 | 2439106000077 |
| 26 | 7895749882524 |
[1,5,16,47,154,496,1601,5183,16777,54298,175777, 569008,1841952,5962675,19302067,62483633, 202268864,654774451,2119602518,6861469468, 22211599969,71902261547,232758343993,753473472226, 2439106000077,7895749882524] |