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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 5544 |
| 3 | 2194500 |
| 4 | 1032711750 |
| 5 | 535163031270 |
| 6 | 294927297193620 |
| 7 | 169625328357359160 |
| 8 | 100668944872954458000 |
| 9 | 61198401105544584882000 |
| 10 | 37917347562767179794006720 |
| 11 | 23857493242377754986443300520 |
| 12 | 15203471586481919338384641390900 |
| 13 | 9792887011999654848831359131972500 |
[1,21,5544,2194500,1032711750,535163031270, 294927297193620,169625328357359160, 100668944872954458000,61198401105544584882000, 37917347562767179794006720, 23857493242377754986443300520, 15203471586481919338384641390900, 9792887011999654848831359131972500] |