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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 64 |
| 3 | 1424 |
| 4 | 36800 |
| 5 | 1036160 |
| 6 | 30843648 |
| 7 | 954671360 |
| 8 | 30415326208 |
| 9 | 990831196160 |
| 10 | 32853724512256 |
| 11 | 1105132250898432 |
| 12 | 37620337933582336 |
| 13 | 1293586791397064704 |
| 14 | 44863864476704768000 |
| 15 | 1567543145774827241472 |
| 16 | 55125711913212153954304 |
[1,4,64,1424,36800,1036160,30843648,954671360, 30415326208,990831196160,32853724512256, 1105132250898432,37620337933582336, 1293586791397064704,44863864476704768000, 1567543145774827241472,55125711913212153954304] |