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A052601 as a simple table

na(n)
01
10
20
312
448
5240
64320
750400
8564480
99434880
10166924800
112953843200
1260354201600
131357490534400
1431907254579200
15808142759424000
1622052620541952000
17635257746579456000
1819347973338710016000

[1,0,0,12,48,240,4320,50400,564480,9434880,
 166924800,2953843200,60354201600,1357490534400,
 31907254579200,808142759424000,22052620541952000,
 635257746579456000,19347973338710016000]