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A262413 as a simple table

na(n)
12
24
3270
418228
59401742
615231780324
7114043973318270
83210825131209677780
9376663000295700912108942
10173793136176160952800090974444
11324528460592527213101965898811701630

[2,4,270,18228,9401742,15231780324,
 114043973318270,3210825131209677780,
 376663000295700912108942,
 173793136176160952800090974444,
 324528460592527213101965898811701630]