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A276598 as a simple table

na(n)
10
25
330
4175
51020
65945
734650
8201955
91177080
106860525
1139986070
12233055895
131358349300
147917039905
1546143890130
16268946300875
171567533915120
189136257189845
1953250009223950
20310363798153855
211808932779699180
2210543232880041225
2361450464500548170

[0,5,30,175,1020,5945,34650,201955,1177080,
 6860525,39986070,233055895,1358349300,7917039905,
 46143890130,268946300875,1567533915120,
 9136257189845,53250009223950,310363798153855,
 1808932779699180,10543232880041225,
 61450464500548170]