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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 640 |
| 3 | 15360 |
| 4 | 278528 |
| 5 | 4259840 |
| 6 | 58195968 |
| 7 | 734003200 |
| 8 | 8724152320 |
| 9 | 99052683264 |
| 10 | 1084479242240 |
| 11 | 11527692222464 |
| 12 | 119571889520640 |
| 13 | 1214960348692480 |
| 14 | 12129812277624832 |
| 15 | 119275021381140480 |
| 16 | 1157425104234217472 |
[16,640,15360,278528,4259840,58195968,734003200, 8724152320,99052683264,1084479242240, 11527692222464,119571889520640,1214960348692480, 12129812277624832,119275021381140480, 1157425104234217472] |