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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 361 |
| 5 | 4301 |
| 6 | 60001 |
| 7 | 954325 |
| 8 | 16984577 |
| 9 | 333572041 |
| 10 | 7151967181 |
| 11 | 165971975621 |
| 12 | 4139744524345 |
| 13 | 110333560295557 |
| 14 | 3126749660583641 |
| 15 | 93819198847833061 |
| 16 | 2969676820062708481 |
| 17 | 98843743790129998865 |
| 18 | 3449675368718647501717 |
| 19 | 125921086600579132143781 |
| 20 | 4796519722094585691925961 |
[1,1,5,37,361,4301,60001,954325,16984577, 333572041,7151967181,165971975621,4139744524345, 110333560295557,3126749660583641, 93819198847833061,2969676820062708481, 98843743790129998865,3449675368718647501717, 125921086600579132143781, 4796519722094585691925961] |