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A015775 as a simple table

na(n)
12
24
316
425
5170
6256
7264
81920
99384
1026664
1165536
12263040
13437760
141057800
152038648320

[2,4,16,25,170,256,264,1920,9384,26664,65536,
 263040,437760,1057800,2038648320]