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A280215 as a simple table

na(n)
16
2307
34382
449328
5474433
64245153
736290440
8298709773
92400798535
1018900933338
11146535311611
121121019997031
138483337931994
1463591088869355
15472819500109525
163490412406841210
1725604337866580661
18186765973876472967

[6,307,4382,49328,474433,4245153,36290440,
 298709773,2400798535,18900933338,146535311611,
 1121019997031,8483337931994,63591088869355,
 472819500109525,3490412406841210,
 25604337866580661,186765973876472967]