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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 81 |
| 3 | 1116 |
| 4 | 15471 |
| 5 | 214974 |
| 6 | 2990115 |
| 7 | 41609376 |
| 8 | 579152592 |
| 9 | 8062039188 |
| 10 | 112233642606 |
| 11 | 1562482974384 |
| 12 | 21752802921528 |
| 13 | 302844316749948 |
| 14 | 4216246872393294 |
| 15 | 58699445770011312 |
| 16 | 817227085779238851 |
| 17 | 11377633930294786182 |
| 18 | 158402278494943048161 |
| 19 | 2205317108305048202244 |
[1,6,81,1116,15471,214974,2990115,41609376, 579152592,8062039188,112233642606,1562482974384, 21752802921528,302844316749948,4216246872393294, 58699445770011312,817227085779238851, 11377633930294786182,158402278494943048161, 2205317108305048202244] |