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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 595 |
| 3 | 9900 |
| 4 | 149941 |
| 5 | 2145210 |
| 6 | 29561815 |
| 7 | 396813000 |
| 8 | 5224781881 |
| 9 | 67791656790 |
| 10 | 869540915035 |
| 11 | 11050958595300 |
| 12 | 139392712421821 |
| 13 | 1747306114774770 |
| 14 | 21788203659532255 |
| 15 | 270484281270892800 |
[1,30,595,9900,149941,2145210,29561815,396813000, 5224781881,67791656790,869540915035, 11050958595300,139392712421821,1747306114774770, 21788203659532255,270484281270892800] |