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A275016 as a simple table

na(n)
10
20
30
45
55
615
735
855
9135
10255
11495
121055
132015
144095
158255
1616255
1732895
1865535
19130815
20262655
21523775
221048575
232098175
244192255
258390655
2616777215
2733550335
2867117055
29134209535
30268435455
31536887295
321073709055
332147516415
344294967295
358589869055
3617180000255

[0,0,0,5,5,15,35,55,135,255,495,1055,2015,4095,
 8255,16255,32895,65535,130815,262655,523775,
 1048575,2098175,4192255,8390655,16777215,33550335,
 67117055,134209535,268435455,536887295,1073709055,
 2147516415,4294967295,8589869055,17180000255]