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A073976 as a simple table

na(n)
10
22
318
472
5300
61440
77056
839312
9252720
101658880
1110349856
1262099136
13367960320
142179768320
1512976433280
1677787495936
17468419708160
182821539889152
1916960580969472
20101753146100736
21609923828966400
223656096522698752
2321926115464435712
24131556692786614272

[0,2,18,72,300,1440,7056,39312,252720,1658880,
 10349856,62099136,367960320,2179768320,
 12976433280,77787495936,468419708160,
 2821539889152,16960580969472,101753146100736,
 609923828966400,3656096522698752,
 21926115464435712,131556692786614272]