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A166766 as a simple table

na(n)
16
256
3292
41254
54942
618584
767756
8241542
9846502
102927816
1110023380
1234042358
13114900334
14385933816
151291392908

[6,56,292,1254,4942,18584,67756,241542,846502,
 2927816,10023380,34042358,114900334,385933816,
 1291392908]