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| n | a(n) |
|---|---|
| 1 | 54 |
| 2 | 729 |
| 3 | 6075 |
| 4 | 40095 |
| 5 | 229635 |
| 6 | 1194102 |
| 7 | 5786802 |
| 8 | 26572050 |
| 9 | 116917020 |
| 10 | 496897335 |
| 11 | 2051893701 |
| 12 | 8269753401 |
| 13 | 32643763425 |
| 14 | 126557359740 |
| 15 | 482984209620 |
| 16 | 1817776934388 |
| 17 | 6757388169138 |
| 18 | 24843338857125 |
| 19 | 90429753439935 |
| 20 | 326206114635555 |
| 21 | 1167092987918319 |
| 22 | 4144371018322194 |
[54,729,6075,40095,229635,1194102,5786802, 26572050,116917020,496897335,2051893701, 8269753401,32643763425,126557359740,482984209620, 1817776934388,6757388169138,24843338857125, 90429753439935,326206114635555,1167092987918319, 4144371018322194] |