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A073972 as a simple table

na(n)
10
20
30
436
5300
61440
77056
842336
9272160
101700352
1110349856
1262099136
13367960320
142173796352
1512940881408
1677716392192
17468419708160
182821539889152
1916960580969472
20101763485816832
21609985806796800
223656220357427200
2321926115464435712
24131556692786614272

[0,0,0,36,300,1440,7056,42336,272160,1700352,
 10349856,62099136,367960320,2173796352,
 12940881408,77716392192,468419708160,
 2821539889152,16960580969472,101763485816832,
 609985806796800,3656220357427200,
 21926115464435712,131556692786614272]