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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 10 |
| 4 | 26 |
| 5 | 92 |
| 6 | 282 |
| 7 | 1044 |
| 8 | 3558 |
| 9 | 13436 |
| 10 | 48578 |
| 11 | 185516 |
| 12 | 693332 |
| 13 | 2667160 |
| 14 | 10156772 |
| 15 | 39277160 |
| 16 | 151224134 |
| 17 | 587138284 |
| 18 | 2275980402 |
| 19 | 8864583324 |
| 20 | 34516282476 |
| 21 | 134779569352 |
| 22 | 526441907852 |
| 23 | 2060002196632 |
| 24 | 8065098605532 |
| 25 | 31615272898392 |
| 26 | 124004228696052 |
[1,2,3,10,26,92,282,1044,3558,13436,48578,185516, 693332,2667160,10156772,39277160,151224134, 587138284,2275980402,8864583324,34516282476, 134779569352,526441907852,2060002196632, 8065098605532,31615272898392,124004228696052] |