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A180222 as a simple table

na(n)
10
21
34
424
5128
6704
73840
820992
9114688
10626688
113424256
1218710528
13102236160
14558628864
153052404736
1616678649856
1791133837312
18497964548096
192720928890880
2014867431948288
2181237158920192
22443888091267072
232425449636429824
2413252903275855872

[0,1,4,24,128,704,3840,20992,114688,626688,
 3424256,18710528,102236160,558628864,3052404736,
 16678649856,91133837312,497964548096,
 2720928890880,14867431948288,81237158920192,
 443888091267072,2425449636429824,
 13252903275855872]