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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 96 |
| 3 | 1206 |
| 4 | 14016 |
| 5 | 157926 |
| 6 | 1755936 |
| 7 | 19409046 |
| 8 | 213968256 |
| 9 | 2355994566 |
| 10 | 25927658976 |
| 11 | 285262842486 |
| 12 | 3138184236096 |
| 13 | 34521491440806 |
| 14 | 379743730067616 |
| 15 | 4177217651837526 |
| 16 | 45949577275681536 |
| 17 | 505446265559840646 |
| 18 | 5559913498794965856 |
| 19 | 61159071374928218166 |
[0,6,96,1206,14016,157926,1755936,19409046, 213968256,2355994566,25927658976,285262842486, 3138184236096,34521491440806,379743730067616, 4177217651837526,45949577275681536, 505446265559840646,5559913498794965856, 61159071374928218166] |