| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 30 |
| 3 | 31 |
| 4 | 1890 |
| 5 | 1921 |
| 6 | 57599 |
| 7 | 59520 |
| 8 | 3628799 |
| 9 | 3688319 |
| 10 | 110590050 |
| 11 | 114278369 |
| 12 | 6967292190 |
| 13 | 7081570559 |
| 14 | 212332838401 |
| 15 | 219414408960 |
| 16 | 13377197376001 |
| 17 | 13596611784961 |
| 18 | 407678939139870 |
| 19 | 421275550924831 |
| 20 | 25684211994629730 |
| 21 | 26105487545554561 |
| 22 | 782743350815711999 |
[1,1,30,31,1890,1921,57599,59520,3628799,3688319, 110590050,114278369,6967292190,7081570559, 212332838401,219414408960,13377197376001, 13596611784961,407678939139870,421275550924831, 25684211994629730,26105487545554561, 782743350815711999] |