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A178708 as a simple table

na(n)
11
21
37
47
596
696
796
8189
9902
10902
114267
128375
138375
148375
1511791
1611791
17112954
18436893
19726844
20726844
212005750
222005750
232005750
2442248747
25171498580
26171498580
27171498580

[1,1,7,7,96,96,96,189,902,902,4267,8375,8375,8375,
 11791,11791,112954,436893,726844,726844,2005750,
 2005750,2005750,42248747,171498580,171498580,
 171498580]