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A266463 as a simple table

na(n)
12
24
312
466
5735
618808
71231170
8223521350
9119000455681
10193166954325425
11983670413713595700

[2,4,12,66,735,18808,1231170,223521350,
 119000455681,193166954325425,983670413713595700]