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| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 540 |
| 3 | 16512 |
| 4 | 524288 |
| 5 | 16796160 |
| 6 | 536870912 |
| 7 | 17180393472 |
| 8 | 549761399856 |
| 9 | 17592219598848 |
| 10 | 562949953421312 |
| 11 | 18014402847965184 |
| 12 | 576460752303423488 |
| 13 | 18446744211148505088 |
| 14 | 590295811461438504960 |
| 15 | 18889465940274673876992 |
[18,540,16512,524288,16796160,536870912, 17180393472,549761399856,17592219598848, 562949953421312,18014402847965184, 576460752303423488,18446744211148505088, 590295811461438504960,18889465940274673876992] |