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A278613 as a simple table

na(n)
03
18
221
355
4145
5381
61001
72633
86921
918193
1047833
11125745
12330569
13869057
142284665
156006193
1615789865
1741510241
18109127129
19286886801

[3,8,21,55,145,381,1001,2633,6921,18193,47833,
 125745,330569,869057,2284665,6006193,15789865,
 41510241,109127129,286886801]