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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2027025 |
| 2 | 10321920 |
| 3 | 34459425 |
| 4 | 92897280 |
| 5 | 218243025 |
| 6 | 464486400 |
| 7 | 916620705 |
| 8 | 1703116800 |
| 9 | 3011753745 |
| 10 | 5109350400 |
| 11 | 8365982625 |
| 12 | 13284311040 |
| 13 | 20534684625 |
| 14 | 30996725760 |
| 15 | 45808142625 |
| 16 | 66421555200 |
| 17 | 94670161425 |
| 18 | 132843110400 |
| 19 | 183771489825 |
| 20 | 250925875200 |
| 21 | 338526428625 |
| 22 | 451666575360 |
[0,2027025,10321920,34459425,92897280,218243025, 464486400,916620705,1703116800,3011753745, 5109350400,8365982625,13284311040,20534684625, 30996725760,45808142625,66421555200,94670161425, 132843110400,183771489825,250925875200, 338526428625,451666575360] |