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A215227 as a simple table

na(n)
18
256
3336
42352
515120
6105168
7710640
84883424
933384960
10228945360
111568401296
1210751253072
1373683206688
14505043014560

[8,56,336,2352,15120,105168,710640,4883424,
 33384960,228945360,1568401296,10751253072,
 73683206688,505043014560]