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A074621 as a simple table

na(n)
02
115
2117
3945
47857
566825
6578097
75062905
844726337
9397498185
103547250577
1131743856665
12284606318817
132554926522345
1422955156619057
15206361317079225
161855841298759297
1716694108359111305
18150196195253667537

[2,15,117,945,7857,66825,578097,5062905,44726337,
 397498185,3547250577,31743856665,284606318817,
 2554926522345,22955156619057,206361317079225,
 1855841298759297,16694108359111305,
 150196195253667537]