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A137889 as a simple table

na(n)
16
236
3384
45460
584816
61347396
721521184
8344194740
95506552176
1088102619556
111409633169984
1222554096102420
13360865400232336
145773845857280516
1592381531540306784
161478104495968880500
1723649671900884069296
18378394750275931314276
196054316003862820691584

[6,36,384,5460,84816,1347396,21521184,344194740,
 5506552176,88102619556,1409633169984,
 22554096102420,360865400232336,5773845857280516,
 92381531540306784,1478104495968880500,
 23649671900884069296,378394750275931314276,
 6054316003862820691584]