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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 1 |
| 7 | 3 |
| 8 | 11 |
| 9 | 37 |
| 10 | 125 |
| 11 | 423 |
| 12 | 1429 |
| 13 | 4811 |
| 14 | 16111 |
| 15 | 53589 |
| 16 | 176905 |
| 17 | 579407 |
| 18 | 1882943 |
| 19 | 6073469 |
| 20 | 19452705 |
| 21 | 61900375 |
| 22 | 195799527 |
| 23 | 615978629 |
| 24 | 1928297807 |
| 25 | 6009527345 |
| 26 | 18653079889 |
| 27 | 57686469763 |
| 28 | 177812890843 |
| 29 | 546456642501 |
| 30 | 1674844848629 |
[1,1,3,11,37,125,423,1429,4811,16111,53589,176905, 579407,1882943,6073469,19452705,61900375, 195799527,615978629,1928297807,6009527345, 18653079889,57686469763,177812890843,546456642501, 1674844848629] |