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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 10 |
| 4 | 24 |
| 5 | 54 |
| 6 | 96 |
| 7 | 200 |
| 8 | 442 |
| 9 | 650 |
| 10 | 1548 |
| 11 | 2370 |
| 12 | 4060 |
| 13 | 7670 |
| 14 | 15792 |
| 15 | 25740 |
| 16 | 49074 |
| 17 | 81900 |
| 18 | 147756 |
| 19 | 251012 |
[1,2,6,10,24,54,96,200,442,650,1548,2370,4060, 7670,15792,25740,49074,81900,147756,251012] |