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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 22 |
| 3 | 95 |
| 4 | 546 |
| 5 | 2765 |
| 6 | 14503 |
| 7 | 74812 |
| 8 | 386556 |
| 9 | 2008698 |
| 10 | 10415923 |
| 11 | 54096117 |
| 12 | 280793815 |
| 13 | 1457402796 |
| 14 | 7564115674 |
| 15 | 39256668738 |
| 16 | 203743660496 |
| 17 | 1057439556784 |
| 18 | 5488205547156 |
| 19 | 28484308704921 |
| 20 | 147836021658293 |
| 21 | 767281388051654 |
[4,22,95,546,2765,14503,74812,386556,2008698, 10415923,54096117,280793815,1457402796,7564115674, 39256668738,203743660496,1057439556784, 5488205547156,28484308704921,147836021658293, 767281388051654] |