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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 32 |
| 3 | 384 |
| 4 | 10240 |
| 5 | 40960 |
| 6 | 61931520 |
| 7 | 49545216 |
| 8 | 7927234560 |
| 9 | 475634073600 |
| 10 | 1993133260800 |
| 11 | 177167400960 |
| 12 | 48753634065776640 |
| 13 | 195014536263106560 |
| 14 | 39002907252621312000 |
| 15 | 842462796656620339200 |
| 16 | 2204424056667635712000 |
| 17 | 79359266040034885632000 |
[1,4,32,384,10240,40960,61931520,49545216, 7927234560,475634073600,1993133260800, 177167400960,48753634065776640,195014536263106560, 39002907252621312000,842462796656620339200, 2204424056667635712000,79359266040034885632000] |