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A181203 as a simple table

na(n)
10
2840
3360360
4199536480
5140229804000
6118949931243000
7117015012361447200
8129624266420759510400
9158211402715245473193600
10209298196564031904834960000
11296336346592302886974184080000

[0,840,360360,199536480,140229804000,
 118949931243000,117015012361447200,
 129624266420759510400,158211402715245473193600,
 209298196564031904834960000,
 296336346592302886974184080000]