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A207891 as a simple table

na(n)
12
216
384
4870
511196
6205258
75888458
8243318702
913997746826
101221755612002
11156218303323950
1228414320426633740
137652673923813342076
143016400502880224884497
151720903600232362236817474

[2,16,84,870,11196,205258,5888458,243318702,
 13997746826,1221755612002,156218303323950,
 28414320426633740,7652673923813342076,
 3016400502880224884497,1720903600232362236817474]