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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 27594 |
| 3 | 61171656 |
| 4 | 14467258260 |
| 5 | 1003867701480 |
| 6 | 32071565263710 |
| 7 | 599941851861744 |
| 8 | 7585009898729256 |
| 9 | 71097458824894320 |
| 10 | 526315789473684210 |
| 11 | 3218899497284976120 |
| 12 | 16814736808980154044 |
| 13 | 76943173177655058456 |
| 14 | 314542313628890231430 |
| 15 | 1166756747396368729440 |
| 16 | 3976729669784964390480 |
| 17 | 12582759772902701307744 |
| 18 | 37275544492386193492506 |
| 19 | 104127350297911241532840 |
| 20 | 275941052631578947368420 |
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