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| n | a(n) |
|---|---|
| 0 | 20 |
| 1 | 9 |
| 2 | 243 |
| 3 | 1782 |
| 4 | 14661 |
| 5 | 118665 |
| 6 | 962604 |
| 7 | 7806213 |
| 8 | 63306927 |
| 9 | 513404406 |
| 10 | 4163593185 |
| 11 | 33765791949 |
| 12 | 273832882308 |
| 13 | 2220722303697 |
| 14 | 18009552066651 |
| 15 | 146053365199830 |
| 16 | 1184459524998669 |
| 17 | 9605696961789153 |
| 18 | 77900014457512092 |
[20,9,243,1782,14661,118665,962604,7806213, 63306927,513404406,4163593185,33765791949, 273832882308,2220722303697,18009552066651, 146053365199830,1184459524998669,9605696961789153, 77900014457512092] |