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A013894 as a simple table

na(n)
020
164000000
2204800000000000
3655360000000000000000
42097152000000000000000000000
56710886400000000000000000000000000
621474836480000000000000000000000000000000
768719476736000000000000000000000000000000000000
8219902325555200000000000000000000000000000000000000000

[20,64000000,204800000000000,
 655360000000000000000,
 2097152000000000000000000000,
 6710886400000000000000000000000000,
 21474836480000000000000000000000000000000,
 68719476736000000000000000000000000000000000000,
 21990232555520000000000000000000000000000000000000\
 0000]