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A189908 as a simple table

na(n)
152
22704
3140608
43810503
5101895401
62719427244
773093919926
81951128590287
951589584277346
101358147318157857
1135658646898466208
12933963332609935010
1324435853969347309728
14638718834034880161561
1516686274811151524544035

[52,2704,140608,3810503,101895401,2719427244,
 73093919926,1951128590287,51589584277346,
 1358147318157857,35658646898466208,
 933963332609935010,24435853969347309728,
 638718834034880161561,16686274811151524544035]