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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 30 |
| 3 | 300 |
| 4 | 3165 |
| 5 | 34584 |
| 6 | 386880 |
| 7 | 4400928 |
| 8 | 50692266 |
| 9 | 589584042 |
| 10 | 6910397886 |
| 11 | 81507086634 |
| 12 | 966408021984 |
| 13 | 11509174498254 |
| 14 | 137584249375308 |
| 15 | 1650109151463594 |
| 16 | 19847075122106145 |
| 17 | 239316542492974317 |
| 18 | 2892135259684291248 |
| 19 | 35021199836282568456 |
| 20 | 424837125616822551264 |
[1,3,30,300,3165,34584,386880,4400928,50692266, 589584042,6910397886,81507086634,966408021984, 11509174498254,137584249375308,1650109151463594, 19847075122106145,239316542492974317, 2892135259684291248,35021199836282568456, 424837125616822551264] |