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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 56 |
| 3 | 1264 |
| 4 | 40640 |
| 5 | 1711744 |
| 6 | 89533184 |
| 7 | 5607463936 |
| 8 | 409621790720 |
| 9 | 34218229227520 |
| 10 | 3219000547131392 |
| 11 | 336858779869020160 |
| 12 | 38823224436435845120 |
| 13 | 4886982191317154529280 |
| 14 | 667188807538423365632000 |
| 15 | 98200163047169655115350016 |
| 16 | 15501781660715229538766815232 |
[1,4,56,1264,40640,1711744,89533184,5607463936, 409621790720,34218229227520,3219000547131392, 336858779869020160,38823224436435845120, 4886982191317154529280,667188807538423365632000, 98200163047169655115350016, 15501781660715229538766815232] |