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| n | a(n) |
|---|---|
| 1 | 3260 |
| 2 | 4938 |
| 3 | 10820 |
| 4 | 25882 |
| 5 | 80438 |
| 6 | 253148 |
| 7 | 856022 |
| 8 | 3063064 |
| 9 | 10885914 |
| 10 | 39035588 |
| 11 | 141641316 |
| 12 | 513510222 |
| 13 | 1860892000 |
| 14 | 6752701006 |
| 15 | 24520021374 |
| 16 | 89037718964 |
| 17 | 323273690688 |
| 18 | 1173779249448 |
| 19 | 4262540743302 |
| 20 | 15479263400324 |
| 21 | 56209300530872 |
[3260,4938,10820,25882,80438,253148,856022, 3063064,10885914,39035588,141641316,513510222, 1860892000,6752701006,24520021374,89037718964, 323273690688,1173779249448,4262540743302, 15479263400324,56209300530872] |