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A042949 as a simple table

na(n)
10
20
348
4576
54752
636864
7271680
81931808
913384320
1091133664
11610863072
124051654752
1326592186336
14173304754368
151121024960064

[0,0,48,576,4752,36864,271680,1931808,13384320,
 91133664,610863072,4051654752,26592186336,
 173304754368,1121024960064]