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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 44 |
| 3 | 1016 |
| 4 | 42384 |
| 5 | 2908544 |
| 6 | 306305856 |
| 7 | 46659144832 |
| 8 | 9760451385600 |
| 9 | 2683733034474496 |
| 10 | 936308392553036800 |
| 11 | 403127865773461755904 |
| 12 | 209562975305232836300800 |
| 13 | 129255511221696545852424192 |
| 14 | 93252273300325219683758915584 |
| 15 | 77766048645578119241905858314240 |
[1,4,44,1016,42384,2908544,306305856,46659144832, 9760451385600,2683733034474496,936308392553036800, 403127865773461755904,209562975305232836300800, 129255511221696545852424192, 93252273300325219683758915584, 77766048645578119241905858314240] |