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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 44 |
| 4 | 472 |
| 5 | 63944 |
| 6 | 799416 |
| 7 | 137263244 |
| 8 | 1860249448 |
| 9 | 357974884304 |
| 10 | 1036802274574832 |
| 11 | 15013817777670240 |
| 12 | 47192717951302358280 |
| 13 | 10360599532843724350568 |
| 14 | 154361699651510683256944 |
| 15 | 34589385964787861980005536 |
| 16 | 118349529407778159289257602576 |
[1,4,44,472,63944,799416,137263244,1860249448, 357974884304,1036802274574832,15013817777670240, 47192717951302358280,10360599532843724350568, 154361699651510683256944, 34589385964787861980005536, 118349529407778159289257602576] |