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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 18 |
| 3 | 180 |
| 4 | 342 |
| 5 | 3420 |
| 6 | 6498 |
| 7 | 64980 |
| 8 | 123462 |
| 9 | 1234620 |
| 10 | 2345778 |
| 11 | 23457780 |
| 12 | 44569782 |
| 13 | 445697820 |
| 14 | 846825858 |
| 15 | 8468258580 |
| 16 | 16089691302 |
| 17 | 160896913020 |
| 18 | 305704134738 |
| 19 | 3057041347380 |
| 20 | 5808378560022 |
| 21 | 58083785600220 |
| 22 | 110359192640418 |
| 23 | 1103591926404180 |
| 24 | 2096824660167942 |
[10,18,180,342,3420,6498,64980,123462,1234620, 2345778,23457780,44569782,445697820,846825858, 8468258580,16089691302,160896913020,305704134738, 3057041347380,5808378560022,58083785600220, 110359192640418,1103591926404180,2096824660167942] |