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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 18 |
| 3 | 19 |
| 4 | 702 |
| 5 | 721 |
| 6 | 12959 |
| 7 | 13680 |
| 8 | 505439 |
| 9 | 519119 |
| 10 | 9330462 |
| 11 | 9849581 |
| 12 | 363915378 |
| 13 | 373764959 |
| 14 | 6717919681 |
| 15 | 7091684640 |
| 16 | 262018566721 |
| 17 | 269110251361 |
| 18 | 4836892839858 |
| 19 | 5106003091219 |
| 20 | 188653004123742 |
| 21 | 193759007214961 |
| 22 | 3482556126778079 |
| 23 | 3676315133993040 |
[1,1,18,19,702,721,12959,13680,505439,519119, 9330462,9849581,363915378,373764959,6717919681, 7091684640,262018566721,269110251361, 4836892839858,5106003091219,188653004123742, 193759007214961,3482556126778079,3676315133993040] |