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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 17 |
| 6 | 57 |
| 7 | 191 |
| 8 | 684 |
| 9 | 2482 |
| 10 | 9275 |
| 11 | 35127 |
| 12 | 135156 |
| 13 | 525545 |
| 14 | 2064329 |
| 15 | 8173895 |
| 16 | 32600082 |
| 17 | 130823306 |
| 18 | 527888023 |
| 19 | 2140454687 |
| 20 | 8716907165 |
| 21 | 35638352814 |
| 22 | 146221542191 |
| 23 | 601870210193 |
| 24 | 2484682879348 |
| 25 | 10285116277096 |
| 26 | 42679973961811 |
| 27 | 177514171393035 |
| 28 | 739881841810694 |
| 29 | 3089914920914855 |
| 30 | 12927860306782626 |
[1,1,2,6,17,57,191,684,2482,9275,35127,135156, 525545,2064329,8173895,32600082,130823306, 527888023,2140454687,8716907165,35638352814, 146221542191,601870210193,2484682879348, 10285116277096,42679973961811,177514171393035, 739881841810694,3089914920914855, 12927860306782626] |