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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 35 |
| 4 | 155 |
| 5 | 690 |
| 6 | 3171 |
| 7 | 14620 |
| 8 | 68671 |
| 9 | 323788 |
| 10 | 1538292 |
| 11 | 7342163 |
| 12 | 35208637 |
| 13 | 169337703 |
| 14 | 817064667 |
| 15 | 3952269649 |
| 16 | 19158906154 |
| 17 | 93050722532 |
| 18 | 452711595085 |
| 19 | 2205777113475 |
| 20 | 10761702223075 |
| 21 | 52568689845221 |
| 22 | 257066371994331 |
| 23 | 1258313530733432 |
| 24 | 6164891958547112 |
| 25 | 30228796740536382 |
| 26 | 148335346441221617 |
[1,2,9,35,155,690,3171,14620,68671,323788,1538292, 7342163,35208637,169337703,817064667,3952269649, 19158906154,93050722532,452711595085, 2205777113475,10761702223075,52568689845221, 257066371994331,1258313530733432,6164891958547112, 30228796740536382,148335346441221617] |