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A078531 as a simple table

na(n)
01
12
210
364
4462
53584
629172
7245760
82124694
918743296
10168043980
111526726656
1214025209100
13130056978432
141215785268840
1511445014102016
16108401560073190
171032295389593600
189877854438949980
1994927710773575680

[1,2,10,64,462,3584,29172,245760,2124694,18743296,
 168043980,1526726656,14025209100,130056978432,
 1215785268840,11445014102016,108401560073190,
 1032295389593600,9877854438949980,
 94927710773575680]