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A017726 as a simple table

na(n)
621
6363
642016
6543680
66720720
679657648
68109453344
691078897248
709440350920
7174473879480
72536211932256
733558497368608
7421944067106416
75126600387152400
76687259244541600
773527930788646880
7817198662594653540

[1,63,2016,43680,720720,9657648,109453344,
 1078897248,9440350920,74473879480,536211932256,
 3558497368608,21944067106416,126600387152400,
 687259244541600,3527930788646880,
 17198662594653540]