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A164973 as a simple table

na(n)
01
10
20
30
40
5471744
615462720
72187544320
820535311160
91170657720960
105435640048384
11176680978306560
12518539960673280
1311506838698918080
1424459743253479040
15411769096544123136
16689049736757436600

[1,0,0,0,0,471744,15462720,2187544320,20535311160,
 1170657720960,5435640048384,176680978306560,
 518539960673280,11506838698918080,
 24459743253479040,411769096544123136,
 689049736757436600]