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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 100 |
| 3 | 370 |
| 4 | 1970 |
| 5 | 9040 |
| 6 | 43990 |
| 7 | 209050 |
| 8 | 1002960 |
| 9 | 4793390 |
| 10 | 22944590 |
| 11 | 109759520 |
| 12 | 525189790 |
| 13 | 2512723030 |
| 14 | 12022412680 |
| 15 | 57521607650 |
| 16 | 275215898890 |
| 17 | 1316784620900 |
| 18 | 6300231318630 |
| 19 | 30143802148430 |
| 20 | 144224703156300 |
| 21 | 690051081572450 |
[10,100,370,1970,9040,43990,209050,1002960, 4793390,22944590,109759520,525189790,2512723030, 12022412680,57521607650,275215898890, 1316784620900,6300231318630,30143802148430, 144224703156300,690051081572450] |