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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 5 |
| 4 | 71 |
| 5 | 129 |
| 6 | 280 |
| 7 | 839 |
| 8 | 2717 |
| 9 | 8803 |
| 10 | 25414 |
| 11 | 74518 |
| 12 | 227494 |
| 13 | 702137 |
| 14 | 2143691 |
| 15 | 6482983 |
| 16 | 19639879 |
| 17 | 59787428 |
| 18 | 182279554 |
| 19 | 554882961 |
| 20 | 1687253474 |
| 21 | 5131113671 |
| 22 | 15614188211 |
| 23 | 47523441803 |
| 24 | 144618256222 |
| 25 | 440018989420 |
| 26 | 1338830460614 |
[1,5,5,71,129,280,839,2717,8803,25414,74518, 227494,702137,2143691,6482983,19639879,59787428, 182279554,554882961,1687253474,5131113671, 15614188211,47523441803,144618256222,440018989420, 1338830460614] |