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A228792 as a simple table

na(n)
13
216
397
4586
53588
622060
7135768
8835776
95145232
1031675616
11195005248
121200515520
137390763648
1445499943936
15280112449792
161724463325696
1710616356983808
1865357745761280
19402363535587328
202477080763498496

[3,16,97,586,3588,22060,135768,835776,5145232,
 31675616,195005248,1200515520,7390763648,
 45499943936,280112449792,1724463325696,
 10616356983808,65357745761280,402363535587328,
 2477080763498496]