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A001799 as a simple table

na(n)
28
372
42160
515504
6220248
71564920
889324640
9640807200
109246847896
1167087213336
121957095947664
1314342471475696
14211153052281080
151560676296310488
16185256494416099008
171379131680653181504
1820598677144877854232

[8,72,2160,15504,220248,1564920,89324640,
 640807200,9246847896,67087213336,1957095947664,
 14342471475696,211153052281080,1560676296310488,
 185256494416099008,1379131680653181504,
 20598677144877854232]