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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 1708 |
| 3 | 156016 |
| 4 | 19000996 |
| 5 | 2892636208 |
| 6 | 528436162708 |
| 7 | 112625837135056 |
| 8 | 27433137537640996 |
| 9 | 7517361789179684848 |
| 10 | 2288826715171726889908 |
| 11 | 766572192067000875962896 |
| 12 | 280079787805796188648857796 |
| 13 | 110859415083883527695265783088 |
[1,28,1708,156016,19000996,2892636208, 528436162708,112625837135056,27433137537640996, 7517361789179684848,2288826715171726889908, 766572192067000875962896, 280079787805796188648857796, 110859415083883527695265783088] |