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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 21 |
| 6 | 87 |
| 7 | 350 |
| 8 | 1399 |
| 9 | 6689 |
| 10 | 36711 |
| 11 | 196510 |
| 12 | 1037354 |
| 13 | 6147299 |
| 14 | 40106433 |
| 15 | 256572630 |
| 16 | 1621282565 |
| 17 | 11156001505 |
| 18 | 82732094377 |
| 19 | 603846490132 |
| 20 | 4357719350552 |
| 21 | 33658109397606 |
| 22 | 276421527541533 |
[0,1,3,5,21,87,350,1399,6689,36711,196510,1037354, 6147299,40106433,256572630,1621282565,11156001505, 82732094377,603846490132,4357719350552, 33658109397606,276421527541533] |