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A165387 as a simple table

na(n)
25
3104
41409
511960
685841
7534816
83017385
915787165
1077891237
11366749318
121662432947
137302379696
1431240817911
15130688934607
16536275945765
172164142120076
188606910817129
1933793586661904
20131185521194097

[5,104,1409,11960,85841,534816,3017385,15787165,
 77891237,366749318,1662432947,7302379696,
 31240817911,130688934607,536275945765,
 2164142120076,8606910817129,33793586661904,
 131185521194097]