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A205257 as a simple table

na(n)
1240
21814
313728
4103876
5785920
65946280
744989988
8340397184
92575465940
1019486134776
11147433307220
121115489560600
138439863289268
1463856529812904
15483142470500100
163655485938158424
1727657633637846868
18209259373825754344

[240,1814,13728,103876,785920,5946280,44989988,
 340397184,2575465940,19486134776,147433307220,
 1115489560600,8439863289268,63856529812904,
 483142470500100,3655485938158424,
 27657633637846868,209259373825754344]