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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 30 |
| 3 | 288 |
| 4 | 3125 |
| 5 | 36490 |
| 6 | 447478 |
| 7 | 5683186 |
| 8 | 74105002 |
| 9 | 986302778 |
| 10 | 13344661479 |
| 11 | 182998935930 |
| 12 | 2537838036761 |
| 13 | 35530970858236 |
| 14 | 501523116910044 |
| 15 | 7129275916213606 |
| 16 | 101973703002773268 |
| 17 | 1466574750062589956 |
| 18 | 21194869324964207133 |
| 19 | 307642575576365729486 |
| 20 | 4482940969372057898247 |
[1,4,30,288,3125,36490,447478,5683186,74105002, 986302778,13344661479,182998935930,2537838036761, 35530970858236,501523116910044,7129275916213606, 101973703002773268,1466574750062589956, 21194869324964207133,307642575576365729486, 4482940969372057898247] |