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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 81 |
| 3 | 3644 |
| 4 | 291521 |
| 5 | 36440124 |
| 6 | 6559222321 |
| 7 | 1607009468644 |
| 8 | 514243029966081 |
| 9 | 208268427136262804 |
| 10 | 104134213568131402001 |
| 11 | 63001199208719498210604 |
| 12 | 45360863430278038711634881 |
| 13 | 38329929598584942711331474444 |
| 14 | 37563331006613243857104844955121 |
| 15 | 42258747382439899339242950574511124 |
[1,4,81,3644,291521,36440124,6559222321, 1607009468644,514243029966081,208268427136262804, 104134213568131402001,63001199208719498210604, 45360863430278038711634881, 38329929598584942711331474444, 37563331006613243857104844955121, 42258747382439899339242950574511124] |