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A035866 as a simple table

na(n)
01
11640
2673220
3123273880
412774087510
5854286594072
640098332182820
71400550765961960
838011151426301640
9828828255977397080
1014911158035799862332
11226193352868905599400
122945866488164585776650

[1,1640,673220,123273880,12774087510,854286594072,
 40098332182820,1400550765961960,38011151426301640,
 828828255977397080,14911158035799862332,
 226193352868905599400,2945866488164585776650]