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A138897 as a simple table

na(n)
23
320
4420
518144
61330560
7148262400
823351328000
94940103168000
101351612226764800
11464463110651904000
12195848611658219520000
1399430833611096064000000
1459828953024276660224000000
1542103628541617628354969600000
1634261827725741345073856512000000
1731923961833867229762934538240000000

[3,20,420,18144,1330560,148262400,23351328000,
 4940103168000,1351612226764800,464463110651904000,
 195848611658219520000,99430833611096064000000,
 59828953024276660224000000,
 42103628541617628354969600000,
 34261827725741345073856512000000,
 31923961833867229762934538240000000]