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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 100 |
| 3 | 510 |
| 4 | 2601 |
| 5 | 16065 |
| 6 | 99225 |
| 7 | 572040 |
| 8 | 3297856 |
| 9 | 19523816 |
| 10 | 115584001 |
| 11 | 677087229 |
| 12 | 3966354441 |
| 13 | 23333593542 |
| 14 | 137268768004 |
| 15 | 806149925790 |
| 16 | 4734344981025 |
| 17 | 27823208376315 |
| 18 | 163513839286009 |
| 19 | 960678492827472 |
| 20 | 5644189938974976 |
[10,100,510,2601,16065,99225,572040,3297856, 19523816,115584001,677087229,3966354441, 23333593542,137268768004,806149925790, 4734344981025,27823208376315,163513839286009, 960678492827472,5644189938974976] |