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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 18 |
| 5 | 47 |
| 6 | 141 |
| 7 | 416 |
| 8 | 1278 |
| 9 | 3983 |
| 10 | 12616 |
| 11 | 40475 |
| 12 | 131461 |
| 13 | 430548 |
| 14 | 1423924 |
| 15 | 4741118 |
| 16 | 15896509 |
| 17 | 53622384 |
| 18 | 181826538 |
| 19 | 619678461 |
| 20 | 2121171010 |
| 21 | 7290531452 |
| 22 | 25152947775 |
| 23 | 87076167883 |
| 24 | 302422286268 |
| 25 | 1053449686642 |
| 26 | 3679700846025 |
| 27 | 12886585101117 |
| 28 | 45238465102771 |
| 29 | 159171202374935 |
| 30 | 561236984775150 |
| 31 | 1982888741975501 |
[1,1,3,6,18,47,141,416,1278,3983,12616,40475, 131461,430548,1423924,4741118,15896509,53622384, 181826538,619678461,2121171010,7290531452, 25152947775,87076167883,302422286268, 1053449686642,3679700846025,12886585101117, 45238465102771,159171202374935,561236984775150, 1982888741975501] |