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2008年8月06日作为一个简单的表

n个a(n)
21
2
46
5
624
720
8120
9130
1015
11720
12924
13210
145040
157308
162380
17105
1840320
1964224
2026432
212520
22362880
23623376
24303660
2544100
26945
273628800
286636960
293678840
30705320
3134650
3239916800
3376998240
3447324376
3511098780
36866250
3710395

[1,2,6,3,24,20,120,130,15,720,924,210,5040,7308,2380,105,40320,64224,26432,2520,362880,623376,303660,44100,945,3628800,6636960,3678840,705320,34650,39916800,76998240,47324376,11098780,866250,10395]