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| n | a(n) |
|---|---|
| 1 | 129 |
| 2 | 1918 |
| 3 | 18804 |
| 4 | 126591 |
| 5 | 619490 |
| 6 | 2377935 |
| 7 | 7594224 |
| 8 | 21042479 |
| 9 | 52119726 |
| 10 | 117925215 |
| 11 | 247685420 |
| 12 | 488872479 |
| 13 | 915404154 |
| 14 | 1638353711 |
| 15 | 2819638440 |
| 16 | 4689195855 |
| 17 | 7566196934 |
| 18 | 11884886079 |
| 19 | 18225677796 |
| 20 | 27352180415 |
| 21 | 40254857490 |
[129,1918,18804,126591,619490,2377935,7594224, 21042479,52119726,117925215,247685420,488872479, 915404154,1638353711,2819638440,4689195855, 7566196934,11884886079,18225677796,27352180415, 40254857490] |