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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 51 |
| 5 | 2460 |
| 6 | 513619 |
| 7 | 509709696 |
| 8 | 2590569730617 |
| 9 | 71972142178289680 |
| 10 | 11572569464349559854105 |
| 11 | 11332749125368045400133079296 |
| 12 | 70775590368575601248957366910425851 |
| 13 | 2939823814188321813975498471683171002746816 |
| 14 | 844162736935477006294039214093750952242356035727995 |
| 15 | 1736712038520659436678773853448507425382701807453031820800000 |
[1,4,51,2460,513619,509709696,2590569730617, 71972142178289680,11572569464349559854105, 11332749125368045400133079296, 70775590368575601248957366910425851, 2939823814188321813975498471683171002746816, 84416273693547700629403921409375095224235603572799\ 5, 17367120385206594366787738534485074253827018074530\ 31820800000] |